IQ BOTANY. 



short; glabrous throughout; tall, 3° high; leaves lanceolate, acuminate, 

 Humboldt Slough, Nevada. (63.) 



Var. Erect, 6-18' high, glabrous; leaves lyrate, the lateral segments 

 for the most part obsolete, the terminal lobe ovate-oblong, obtuse, sinuately 

 and obtusely dentate, or entire ; pods oblong, (3" long,) equaling or exceeding 

 the pedicels. Wahsatch Mountains, Utah; 6-8,000 feet altitude. No. 482 

 of Geyer's collection is the same ; nearly intermediate betvi^een palustre and 

 obtusum. (64.) 



Bakbaeea vulgaris, Br. Indigenous from Lake Superior north and west- 

 ward, and on the Pacific Coast from Sitka to the Sacramento ; collected by 

 Bigelow in New Mexico. Not uncommon in the mountain canons of Nevada 

 and Utah ; 6-8,000 feet altitude ; June-August. (65.) 



Var. GRACILIS, DC. This is merely a reduced sub-alpine form. East 

 Humboldt and Clover Mountains, Nevada, and in the Wahsatch ; 9,000 feet 

 altitude; June-September. (QQ-) 



Arabis hiesuta. Scop. Alow ordinary form; 1° in height; radical leaves 

 always rosulate ; stems slender, with a few distant oblong or ovate leaves, 

 few to many-flowered; pedicels more or less spreading. Wahsatch and 

 Uinta Mountains, Utah; 6-7,000 feet altitude. (67.) Also another com- 

 mon form, much stouter and taller; strictly radical leaves often wanting, 

 while the cauline ones are numerous and more or less appressed, approaching 

 A. perfoliata in habit, from which only flowering specimens cannot always 

 readily be distinguished. The species is found from Virginia north to the 

 Arctic Circle, and west to the Pacific. It was collected by Fendler in New 

 Mexico. On banks of mountain streams, Nevada and Utah, at an elevation 

 of 5-6,500 feet ; June-October. (68.) 



Aeabis platyspeema. Gray. Proc. A?ner. Acad. 6. 519. Low, (^-1° 

 high,) from a woody base ; leaves, with the stem, hoary with a stellate pubes- 

 cence, spatulate, entire, the uppermost oblong, sessile, obtuse ; raceme few- 

 flowered; flowers pink; pods erect, straight, broadly linear, (1-2 J' long, 2 J" 

 broad,) acuminate, flattened ; valves loosely reticulated ; stigma sessile ; seeds 

 broadly winged.— In the Sierra Nevada, (Brewer,) at an elevation of 13,000 

 feet. Found in the East Humboldt Mountains, Nevada, at 8,000 feet altitude ; 

 September. . (69.) 



Aeabis canescens, Nutt. (?) {A. puberula, Nutt.) Perennial, csespitose, 

 more or less hoary-pubescent, with stellate hairs ; leaves entire, spatulate- 



