Mountain Plants of the Western Cascades

Posts Tagged ‘Lotus’

Over the last year or two, I’ve found a new challenge to amuse myself—learning to identify plants by their cotyledon leaves. Dicots get their name from the two cotyledon leaves that emerge from a newly germinated seed. This first pair of leaves often, if not usually, bears no resemblance to the regular leaves found later on the plant. Most likely, the form of these leaves is defined more by the shape or some other characteristic of the seed. Typically, they are more or less oval. Sometimes they have distinct petioles, sometimes they are sessile. One would be hard pressed to identify these unless they were growing in quantity under the mother plant. Some plants, however, have very unusual cotyledon leaves. These really pique my curiosity.

The compound true leaves of two tiny Lotus micranthus solve the puzzle of the red-striped cotyledons

Might these waterlily-like cotyledons belong to Oemleria cerasiformis? Note also the tiny Nemophila parviflora with its cotyledon leaves still attached.

A couple of years ago, while out on Heckletooth Mountain just east of Oakridge in the fall, some little cotyledon leaves caught my eye. While the shape of the leaf was fairly generic, each one had a distinct red stripe starting at the base and going halfway up the leaf. What could they be? There were plenty of them, and I surmised they were one of many common annuals growing on this low elevation mountain. I brought one home and put it in a pot, hoping to find my answer in the spring. Naturally, I forgot about it over the winter. The following spring, however, there it was again on Tire Mountain, this time with the first true leaf appearing. It was Lotus micranthus, a little annual member of the clover family that is abundant on many of the lower elevation mountains in the area. What a surprise! I checked my pot when I got home, and sure enough, there was a tiny Lotus micranthus. Since then I’ve seen it several times with both the red-striped cotyledon leaves and the first tiny compound true leaves. The stems are red, so perhaps this has something to do with the unusual red stripe on the cotyledons. Read the rest of this entry »

Dome Rock seen from earlier along the trail

On Tuesday (August 5), John took Sabine and me up to Dome Rock (thanks again for all that driving John!). We a had a great day. We went up Coal Creek Rd 2133 (the scene of a very bad day for me a couple of years ago when I ran into a major washout on my way home from Douglas County. The road looks like it has had many other washouts but was passable for the moment at least.). There are some particularly good areas on the way up after the road turns to 5851. There’s a big cirque of sorts, and water comes down from Balm Mountain (T25S.R3E.S23, Douglas County I’m afraid). We stopped at a wetland along the road first and noticed blooming Trifolium howellii, some Oxalis suksdorfii and lots of tall blooming Rorippa. I noticed there’s no Rorippa on the OFP Atlas for around the area, but I have seen low-growing R. curvisiliqua at both Groundhog and Moon Point. This certainly looked different, but many photos of curvisiliqua show it upright. I will have to study that genus more.

Epilobium luteum & Mimulus guttatus below Balm Mountain

Then we made a few stops at the many little creeks that come down off the cliffs. The Epilobium luteum that both John and I had seen before was just coming into bloom. We saw plants in several other spots during the day that were probably E. luteum but didn’t even have buds yet. It seems like a good area to look for more. There was also some Claytonia cordifolia coming into bloom and lots of a Stellaria John keyed out to calycantha. Another genus I need to sit down and study. There was a big patch of Artemisia on the side of the road, something I don’t see much Lane County. It had much wider leaf blades than the ones so common in Linn County. They did look similar to the ones at Groundhog however. There was also some Collomia tinctoria on the roadside. We passed by Loletta Lakes, a very large wetland, and the cliff where I saw my only Douglas County Castilleja rupicola. So many places to explore up there. We’ll have to just do a day of roadside botanizing sometime. Read the rest of this entry »