18 



BOTANY. 



radical leaves, or quite densely covered with a stellate pubescence ; the seeds 

 are either oblong, closely arranged in two strictly parallel rows, or loosely 

 and irregularly scattered and nearly orbicular ; pods erect and straight, or 

 spreading and arcuate ; biennial, 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 pubescent. East Humboldt 

 and Clover Mountains, Nevada, and in the Uintas; 8-10,000 feet altitude; 

 July-September. Also collected by Lyall on the northwestern boundary, 

 and by Brewer in California. (75.) 



Akabis eeteofeacta, Grrah. {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 cauHne sagittate and partly clasping ; flowers spreading or reflexed, hght 

 rose-color or nearly white ; siliques linear, elongated, straight, or nearly so, 

 more or less reflexed ; seeds in two rows, margined. — A comparison of nu- 

 merous specimens can leave no doubt of the propriety of uniting A. patula 

 with A. retrofracta. Both are referred by Dr. Hooker to A. mollis. The 

 flowers are uniformly light-colored and the pubescence stellate, though the 

 lower stems are occasionally hirsute. A single specimen has even the siHques 

 pubescent. The leaves vary from all entire to all coarsely dentate, sagittate- 

 amplexicaul or simply clasping, broad-lanceolate or almost linear ; stems one or 

 several, simple or branched. Sisymbrium reflexu7n, KelL, [Proc. Col. Acad. 

 2.101, fig. 29,) is doubtless the same. From Canada to Colorado and Califor- 

 nia, northward to the Arctic Circle and Grreenland. Frequent in Nevada and 

 Utah, in the former especially; 4,500-8,000 feet altitude ; April-July. (76.) 



Aeabis aecuata. Gray. {Streptanthus, Nutt.) "Hirsutely villous, with 

 branching hairs ; leaves lanceolate-linear, remotely serrulate, the cauline sagit- 

 tate and clasping, very 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 sub- 

 erect, by the rather more villous pubescence, and by the more arcuate siliques. 

 It may prove to be but a variety. Upper California. On the foot-hills of the 



