Toxicodendron diversilobum. Rhus diversilola, Torr. &
Gray, FL i 218.
E.L. Greene had the facility to view specimens, and immediately
pronounce them as known or new species. In
1905, Greene described several segregates from common poison oak, Toxicodendron
diversilobum (T&G) Greene.
These
names do not appear in the Jepson eFlora, nor on the Interchange. They are below.
Greene remarked (in his Leaflets 1905 emphasis added):
This represents a peculiar type of
Toxicodendron belonging exclusively to the Pacific coast. The leaflets and
their lobes are in general rounded and obtuse rather than angular and acute; the
panicles in the original as well as in most of the specific segregates, lax and
pendulous, each fruit suspended on a rather long and slender pedicel. But several inland species have their
panicles as rigidly erect as in the Atlantic type of the genus. Typical T.
diversilobum is from the lower Columbia, and is figured well in Hooker's Flora.
The species seems to extend along the seaboard southward throughout western
Oregon and California to about Monterey, exhibiting much diversity as to the
lobing of the leaf, though the general outline of it remains the same. But
south of Monterey other well defined species appear, and still more of them
away inland among the mountains bordering arid regions in California, Oregon
and Washington. Some of these, of which fair specimens occur in the herbaria,
are here named and defined.
Toxicodendron
comarophyllum Greene, Leafl. Bot. Observ. Crit 1(9): 120. 1905.
From
Tighe's, near San Diego, Calif., Dr. Edw. Palmer, 1875.
BM000884727 &
US00095833. The name has not been lectotypified
Toxicodendron
dryophilum Greene, Leafl. Bot. Observ. Crit. 1(9): 121–122
Little Chico
Creek, Butte Co., Calif. ... 1896 Mrs. R. M. Austin s.n. [in 1896]
“holotype” US00095837,
isotypes NDG12268 and MO-2246530. The name has not been lectotypified
Toxicodendron
isophyllum Greene, Leafl. Bot. Observ. Crit 1(9): 121. 1905.
River banks
near San Jacinto in southern California, 9 March, 1898, J. B. Leiberg 3117
US00095841
is the only on line specimen
Toxicodendron
oxycarpum Greene, Leafl. Bot. Observ. Crit 1(9): 121. 1905
Vicinity of
Santa Cruz, Calif., July, 1884 J. Ball s.n. “ex region collina, California
occidentalis,. Dedecante July. US00095850 is the only on line specimen.
Toxicodendron
vaccarum Greene Leafl. Bot. Observ. Crit 1(9): 121. 1905
Cow Creek
Mountains, Shasta Co., Calif. Baker & Nutting s.n. [in 1896]
NDG09527
& NDG09528. The name has not been lectotypified.
The actual
types, or choices for lectotypes is uncertain.
Greene then became an associate in botany at the Smithsonian Institution
in 1904, hence the most likely home to potential lectotypes is US. Greene moved to South Bend, Indiana along with
his library and herbarium specimens, which are now at NDG.
Uncertain typification of these names means
little if one has poison oak dermatitis.
