I was admiring the buttercups growing along the creek and
decided to run them through the keys to assure I was calling them by the
correct name. I do this with plants that
may have caused me some identification problems in the past, just to check
myself. My reference sources are greater
than they were many years ago and I’m now more practiced at plant
identification, so this is my way of confirming my earlier assumptions. Buttercups are known for their bright yellow
color and five shiny petals, so there’s usually no problem in getting that far
with the identification.
This is Hispid Buttercup, Ranunculus hispidus var. hispidus. At least that’s what it’s called by Gleason
& Cronquist in their 1991 manual. G
& C combined several recognized species into the single species hispidus and then broke that into three
varieties. The combination is supported
by some and opposed by others, making it possible to have some heated
discussions about this plant’s proper identification. Lumped or split doesn’t make any difference
to me. I use G & C because it was
used in the preparation of the County Flora List and using the same reference
makes it easier for me to compare my discoveries with existing county records.
Hispid refers to the presence of short, stiff hairs. There is certainly no shortage of hairs on
this plant. It’s interesting that G
& C does not make any mention of hairs when it describes this species.
Sometimes the plant descriptions have you diving into tiny
reproductive parts of the flower. G
& C uses the shape of the fruit as a dividing character between two of the
varieties. This is something that used
to confuse me, because I didn’t know how to determine fruit characteristics
when all I had to look at was a new bloom.
In some flowers, the shape of the mature fruit is already
represented by the female flower parts.
A little quick dissection can easily expose the parts you need to see. The
two awl-shaped bits to the left give a good idea of what the mature fruit will
look like.
Sometimes the plants don’t match any of the
descriptions. One of the differences
between variety hispidus and variety nitidus, the Swamp Buttercup, is the
repose of the sepals, those parts just below the petals. The sepals are supposed to project outward in
variety hispidus and hang down along
the stalk in variety nitidus. In my plants, the sepals project outward in
young blooms like that one to the left.
As the flowers age, the sepals begin to whither, then drop down and then
drop off. A lot of the flowers appeared
fresh when viewed from the top, but a look beneath showed a lack of
sepals. Fortunately this isn’t the only
character available to divide these two varieties.
Variety hispidus
displays a fibrous rooting system with no rhizome formation and no rooting at
the nodes of sprawling stems. I’ve been
watching these plants for years and this plant definitely exhibits variety hispidus characteristics. I get arguments from people because variety hispidus is supposed to grow in well
drained uplands and my plants are growing near and in the creek. Swamp Buttercup, variety nitidus, is supposed to grow in wetland situations, so some people
automatically assume that these are variety nitidus
because they are growing in the water. I
explain, sometimes to no avail, that in the upper reaches of a watershed in
extremely well drained areas it’s possible for even the creek beds to behave in
a manner consistent with well drained uplands.
The creek is often dry most of the summer and the banks are certainly
like well drained uplands.
You expect a species that has recognizable varieties to
demonstrate a range of traits outside the normal parameters. This plant has added an extra petal to the
regular compliment of five.
Another plant has gone to the extreme and doubled the number
of petals to ten. I’ll bet a competent
horticulturalist could take this plant and develop a line of fine bedding
plants.
Well, I guess before the public would really embrace this
plant it would have to have more blooms and a more compact form. I personally find it quite showy. I just want to be sure I correctly identify
it to everyone else.
We have buttercups spreading from our neighbor's yard across ours. They are quite pretty and grow very close together. Perhaps ours are different than those pictured because they are so closely clustered....
ReplyDeleteHi Lois. Those are most likely the exotic species known as Creeping Buttercup. My parents used to have those and the plants spread out and covered a wide area.
ReplyDeleteVery interesting read and personal take you've developed there Steve. After I read this interesting piece of your's it reminded me of something recently published on Buttercups in England. Perhaps you'll enjoy this as well.
ReplyDeleteButtercups alert farmers to first signs of subarctic fungus in the UK
Thanks again for your posts - Kevin
Hi Kevin. Thanks for the information. I hadn't heard of that before.
ReplyDelete