Another unique feature of Azalea Creek is the remains of a mule trail that accessed at least two mining areas in this watershed, this mining area being called the Yellow Streak Mine. The Yellow Streak Mine is one of three chromite mines in The Cedars, the other two being in the Main Canyon (and known as the Rattlesnake Mine and The Slats). But these later two mines had a road to take out the ore, and in East Austin Creek over the ridge, the magnesite mines there had a small gauge railroad to haul that out to civilization. But in Azalea Creek they used a mule, and carved a route through the rocky slopes and talus to get to and from these mines.
Roger Raiche of Planet Horticulture, a Bay Area Garden Design Firm, offers insight into the natural world and gardens.
Friday, January 28, 2011
Azalea Creek at The Cedars; The Blob and Mule Trail.
Another unique feature of Azalea Creek is the remains of a mule trail that accessed at least two mining areas in this watershed, this mining area being called the Yellow Streak Mine. The Yellow Streak Mine is one of three chromite mines in The Cedars, the other two being in the Main Canyon (and known as the Rattlesnake Mine and The Slats). But these later two mines had a road to take out the ore, and in East Austin Creek over the ridge, the magnesite mines there had a small gauge railroad to haul that out to civilization. But in Azalea Creek they used a mule, and carved a route through the rocky slopes and talus to get to and from these mines.
Thursday, February 18, 2010
Cardamine Uncertainty: The Cedars form of toothwort; heart-shaped foliage marbled in black, silver and purple.


The lovely rhizome (corm) leaves of toothwort at The Cedars showing conspicuous marbling of silver and purple; the undersides of the leaves are always deep purple as is typical for species.
Most Californian plants take advantage of the winter rainy season to get started in their life cycles, but few complete the full process of growing, flowering and setting seed completely contained within these rainy months. At The Cedars (Sonoma Co., CA) there are a few annuals that fit this pattern, and one showy perennial, California toothwort.
Anthocyanins are dark pigments found in many plants such as the purple color of "red" cabbage, the purple of purple-leafed plums or eggplant skin, the blue of blueberries, the black of blackberries, etc. The race of toothwort at The Cedars seems to represent an enhanced anthocyanin version of the more widespread species (Cardamine californica).

Young growth often emerges and exhibits very dark, almost black coloration; seen above left in front of rock with leaf and new stem. Right picture shows coloration persists into stem elongation and early flowering.
Rhizome leaf, the first leaf to appear and typically different looking from the leaves on the flowering stems which emerge just afterward. Both here show strong purple coloration in the upper leaf while the leaf on the right also shows the silvery character (rather than green).
Beyond the basic question of what is the best species name for this entity, there is the fact that the plants at The Cedars have characters not characteristic of either species - especially the pronounced leaf coloration/mottling characters shown in the pictures. Before corresponding with Al-Shehbaz, I had thought I had hit on the answer, as I noticed that in the Sonoma Flora (Best et al, 1996) that C. pachystigma var. dissectifolia was listed as occurring in NE Sonoma Co. up N of Cobb Mt. Looking up this entity online (CalPhotos, Plant Profiles and CalFlora), the pictures of both the species, C. pachystigma and its variety, dissectifolia, have the silvery, purple streaked/mottled leaves of those plants at The Cedars. It didn't seem implausible to think that if this variety occurred in NE Sonoma Co., it could also occur in NW-Central Sonoma Co as a disjunction (separated range or distribution). It seemed particularly plausible as both those entities have an almost exclusive occurrence on serpentine soils and rock - thus The Cedars seemed ideal. Furthermore, several dozen other plants at The Cedars are disjunctions - thus this fit that "theme" perfectly.
But since in JM II, C. pachystigma will be restricted to plants with simple leaves on the stem (not 3 or 5-foliate as at The Cedars) and its variety (v. dissectifolia) won't even exist (except as a synonym of C. pachystigma), this option is no longer a possibility as a name. Since C. californica is so widespread in our area, it is perhaps enticing to place The Cedars toothwort into the more northern species, Nuttall's toothwort, however more features fit California toothwort than that species. Thus we are left with considering it as just an exceptional form or race of California toothwort.

As one drives into The Cedars, typical California toothwort is common in grassy meadows, oak savannah, and open woodlands for many miles - there is nothing unusual about this. As soon as one enters the "hard" serpentine canyon of The Cedars though, one can immediately recognize that the plant has become different - more isolated individuals, shorter and stouter, thicker leaves with pronounced colorations on the upper surface, and more pink or rose pink flower color (some are white, but all age pink, while some start deep pink and age deeper). It is clear that The Cedars entity is not only more obvious, it is bolder in nearly every visual feature. To my eye, the plants remind me of the vigorous robust plants one would see in the first season of an area that has burned (the previous season) - sort of an exaggerated example of what the plant might more normally look like. Here however, there has been no fire and these characters show up every year even in overgrown sites.
Some leaves have pointed tips on the lobes, others curl back.
So for now, it seems best to consider that these plants have gradually exaggerated certain features that exist in the widespread species, but which probably fit the habitats within The Cedars better. The more pronounced anthocyanin throughout the plant suggests it has gone the same way that the Cedars' endemic purple-leaf stream orchid (Epipactis gigantea f. rubrifolia) has - producing a unique race characterized by this enhanced coloration.

Anthocyanin anyone? The darkest plants would be interesting horticultural selections - however my previous experience trying to grow these at UCBG (Berkeley) suggest this race is challenging and impermanent in cultivation.
It must be kept in mind that the colorations in the young leaves mostly disappears at seed maturity, although some dark or silvery tones may persist - these are primarily juvenile characters, but are conspicuous through flowering, even early seed development. Another caveat is that since these characters have appeared at The Cedars, it is likely that similar races may have appeared elsewhere in open rocky sites - it would be nice to hear of anyone else's experience finding or observing them, and whether they are the same or unique in some other manner.


Since the Cardamine at The Cedars flowers exclusively during the rainy season, the flowers have dealt with that fact by easily bending over, becoming nodding, when wet - thus avoiding water splashing into the sexual parts (anthers and stigmas) of the flowers. I initially wondered if the plants were using some "cue" on rainy days to nod, but it appears most likely that simply the weight of water droplets on the flowers cause this "adjustment", as even a heavy nighttime dew will cause the flowers to bend downward. As can be seen in the above photos, petal size varies considerably - though most are the larger/bigger form as on the right.
I used to think that the toothwort in The Cedars pretty much occurred everywhere within this ultramafic (serpentine) geological unit, but I've noticed this spring that it is actually rather restricted - though abundant and showy in the right places. It seems most profuse in open chaparral or cypress woodland that is very park-like, and on the lower, more stable talus slopes, or rocky ledges. On the rocky talus slopes it is the most impressive, each plant often forming a sizeable colony of basal foliage and one to many flowering stems, somewhat like a bouquet sitting in the sliding rocks. Each plant is different from its neighbors; one with very silvery foliage, one with nearly black foliage, one without any markings at all - and everything in-between. It is one of the joys of visiting The Cedars in the winter months. It can start flowering as soon as 6 weeks after the first rains in fall, but peak months are always January and February when little else is showy.
What this plant's unusual characters reinforce to me is the fact that The Cedars has once again "pushed" a plant into a unique or at the very least unusual set of features - maybe not enough to constitute a species, but obviously distinct to the human eye. The Cedars rules!
Is the leaf coloration some sort of camouflage? I used to say that the foliage seemed like it was trying to match the silvery, reptilian coloration of serpentine. However I have yet to see a leaf that "disappears" against its background to my sight. Thus, to benefit the plant overall any theoretical predator would have to be searching primarily by eyesight and have poor eyesight as well. But who know?
(P.S. anyone missing my excellent article on The Cedars in Fremontia, the journal of the Calfornia Native Plants Society (came out in Dec. but listed as April 09), should consider joining the organization to get a copy. It will be posted on-line in a few months at their website if you want to wait.)
Monday, August 17, 2009
Origin of a Species; the story of a new species for The Cedars, Sonoma Co.
Snow Mountain buckwheat, Eriogonum nervulosum, Hyphyus Creek, Colusa Co. CA.
The Cedars buckwheat, Eriogonum cedrorum, at type locality across from the Upper Mine (site) at The Cedars, Sonoma Co., CA
Close ups of the flower heads of The Cedars buckwheat, showing mostly new yellow flowers. Each flower head is composed of several smaller clusters on separate branches that originate at a cluster of bracts that resemble narrow leaves.
In a reply to Dan, I mentioned that the buckwheat he was referring to was ternate buckwheat (see picture 2 above) and I sent a set of email pictures I had taken the week before at The Cedars to Dan who forwarded them to Jim. I nearly immediately get an email back from Jim Reveal politely telling me that my buckwheat name was wrong, that it almost certainly couldn't be ternate buckwheat at The Cedars. I was wise enough to know that one doesn't argue with an "authority", especially in a group as large and complicated as the genus Eriogonum. So I inquired, what is it then?
Close up of fresh and aging flower heads. Each "head" is composed of several clusters of flowers held in small cup-like structures called involucres. Each involucral cup contains many individual flowers that emerge for several weeks. In the head with the yellow flowers, note that each ring of flowers represents one involucral cup with more buds in the center. In peak flower (when the anthers and/or stigma are ripe), the individual flowers are held upright. Pollinated flowers age red as they get larger, their pedicels get longer, as they turn downward and hang over the side of the involucre.
Thus began a correspondence; by sending pictures, making herbarium vouchers (dried specimens) that I mailed to him, and trying to make observations in the field at The Cedars. Being uncertain about some of the complex features specific to this genus that I was trying to observe, I made some mistakes, but Jim very patiently kept me on track. He also requested a number of Herbaria to send him their herbarium sheets of the two entities in question, E. ternatum and E. nervulousm. Because he was very busy with other work relating to the genus, and because it was also getting quite late in the season for flowering plants, he said, "Let's plan to look at it next July (2009)".
By mid-winter, here in early February, most of the hairs on the upper leaf surface have fallen off leaving a glossy, heart-shaped leaf. The bright red color is atypical, this plant being in a very stressful site, or perhaps it is preparing for Valentine's Day.
Looking across a canyon from one site of The Cedars buckwheat to another, however at this distance the plants are not visible. In The Cedars there is an enormous amount of bare rock which is highly fractured and thus falls apart constantly producing large talus slopes in the gullies and swales. These talus slopes are the preferred habitat for the buckwheat, yet only a small percentage have the buckwheat. The reasons for its limited distribution is unknown.
Looking across a canyon at a serpentine barren and talus slope; this view is a close up of the previous picture's upper right quarter's central section. With binoculars one could see perhaps 15 flowering plants, but in this image only about 5 are visible as red or yellowish mounds. The closely related Snow Mt. buckwheat grows in nearly identical sites, but in more interior terrain. The Cedars is less than 9 miles from the Pacific Ocean by air.
In late July Jim Reveal made a trip to the West Coast to look at several populations of buckwheats. On July 27th he visited a site on Walker Ridge in Colusa Co. in the Complexion Creek drainage to view and collect some Eriogonum nervulosum, the species he felt The Cedars entity belonged to botanically. We then drove up to The Cedars that evening to get an early start, as the next day was predicted to be in the high 90's F. Our neighbor up there, Bette Campbell was kind enough to let Jim stay in her guest cabin, while I "roughed it" up at our camp with the dogs.
Full circle. You may remember this story was prefaced by another story about The Cedars creambush, a mysterious Holodiscus species that intiated this sequence of events. The only woody shrub that occurs within the populations of The Cedars buckwheat, is this very Holodiscus. Here you can see a very old and largely dead shrub with dried flower heads growing amongst dozens of the Eriogonum, though in this picture only a few are faintly visible (one is in the shadow on the left of the creambush). Here we are looking down a large talus slope about 150' high where at least 200 buckwheats grow, though they do not register visibly. The previous picture was taken near the bottom of this slope but horizontal to this view.































