18 
BOTANY. 
radical leaves, or quite densely covered with a stellate pulx'seenee ; the seeds 
are either oblong, closely arranged in two strictly [uwalh'l rows, or loosely 
and irregularly scattered and nearly orbicular ; pods (mtcI ;m<l straiglil, or 
spreading and arcuate; l)iennial, or apparently sometimes perennial. From 
the St. Lawrence and the great lakes to the Rocky Mountains, Oregon and 
California. In the West Humboldt Mountains, Nevada, and in the Wah- 
satch ; 6-7,000 feet altitude ; June. (74.) 
Var. ALPiNA. A reduced subalpine and alpine form, with a few crowded 
purple or white flowers ; glabrous or stellately pu1)escent- East Huml)oldt 
and Clover ^fountains, Nevada, and in the Uintas; 8-10,000 feet altitude; 
July-September. Also collected by Lyall on the northwestern l)oundary, 
and l)y Brewer in California. (75.) 
Arabis retrofeacta, Grab. ( Turritis^ Hook., and T. patula. Grab. ; 
Streptanthus angustifoUus and virgatus, Nutt.) Erect, more or less canescently 
pubescent; leaves lanceolate, radical ones petioled, toothed or nearly entire, 
the cauline sagittate and partly clasping ; flowers spreading or reflexed, light 
rose-color or nearly white ; silifpies linear, elongated, straight, or nearly so, 
more or less reflexed ; seeds in two rows, margined. — A comparison of nu- 
merous specimens can leave no doul)t of the propriety of uniting A. yatula 
with A. retrofracta. Both are referred by Br. Hooker to A. mollis. The 
flowers are uniforndy light-colored and the pubescence stellate, though the 
lower stems are occasionally hirsute. A single specimen has even the siHques 
piilx scent. The leaves vary from all entire to all coarsely dentate, sagittate- 
auiplexicaul or sim^ily clasping, broad-lanceolate or almost Knear; stems one or 
several, simple or branched, ^isymhrium refiexum,, Kell, {Froc. Cal Acad. 
2.101, fig. 29,) is doubtless the same. From Canada to Colorado and Califor- 
nia, northward to the Arctic Circle and Greenland. Frequent in Nevada and 
Utah, in tlui former especially ; 4,500-8,000 feet altitude ; April-July. (7G.) 
Arabis arcfata, Gray. {Streptanthus, Nutt.) '^Hirsutely villous, with 
branching hairs; leaves lanceolate-linear, remotely serrulate, the cauline sagit- 
tate and clasping, veiy acute ; siliques flat and curved downward ; petals (purple) 
obovate, exserted."— Very closely resembling the last, from which it is dis- 
tinguished by its rather larger deep-purple flowers, which are usually sul)- 
erect, by tlie rather more villous pubescence, and by the more arcuate sibques. 
It may |>rove In b(^ but a variety. T^ppc-r Califoi-nia. On the foot-hills of the 
