2g BOTANY. 



entire, lanceolate; the cauline ones sagittate, clasping; flowers in crowded 

 racemes ; petals obovate, the claw exceeding the sepals, nearly white ; raceme 

 elongated in fruit ; siliques spreading, subterete, more or less torulose, acumi- 

 nate with the rather long style ; seeds emarginate, cotyledons often nearly 

 incumbent.— Rarely erect, loosely branched, the branches usually weak and 

 flexuose ; leaves somewhat glaucous, radical ones 3-4' long, on slender petioles ; 

 sepals green or colored ; petals pale-pink or white ; sihques 1-2' long. Growing 

 under bushes in the alkaline valleys of Nevada, and in Salt Lake Valley, 

 Utah. May-July. (108.) 



Thelypodium NtiTTALLii. {Streptanthus sagittaius, Nutt.) Leaves en- 

 tire, the radical ovate, petioled, the cauline ones lanceolate, sagittate, clasping ; 

 flowers loosely racemed ; petals ovate-oblong, the claw exceeding the sepals, 

 purple; siliques spreading, subterete, more or less torulose, acuminate with the 

 rather long style ; seeds emarginate, cotyledons nearly accumbent. — ^Very 

 near to the last and growing in similar localities, but usually stouter and 

 more erect, 3-5° high; radical leaves often 6-8' long, and half as broad; 

 petals and calyx bright purple, or rarely nearly white ; siliques 1-2' long ; 

 cotyledons nearly accumbent, and the seeds, therefore, rather flatter than is 

 usual in the last. Collected by Nuttall in Southern Idaho, and since by Ives 

 in Arizona. (109.) 



Thelypodium beachycaepum, Torr. Proc. Amer. Acad. 6. 520. • Stem 

 virgate ; cauline leaves rather numerous, oblong-lanceolate, sagittate, entire, 

 erect; raceme elongated, very narrow, spiciform; pedicels shorter than the 

 calyx ; sepals linear ; petals very narrowly linear ; anthers mucronate ; siliques 

 ^-I'long, the valves carinately 1-nerved. — The radical leaves, often wanting, 

 are runcinate-pinnatifid, or sometimes nearly entire ; the cauline occasionally 

 sparingly toothed, appressed to the stem or spreading ; the stem often tall 

 and stout, (1-5°,) and with much the habit of T. integrifolium, with which 

 it was found in the Truckee Valley. Collected by the Wilkes Exploring 

 Expedition in California and by Brewer at Mono Lake. (110.) 



Thelypodium laciniatum, Endl. {Pachypodium, Nutt.) Glabrous ; leaves 

 oblong-lanceolote, all petioled, sinuate-dentate, or laciniately pinnatifid, or 

 coarsely and unequally toothed ; flowers on spreading pedicels ; petals linear, 

 three times as long as the calyx ; stipe very short ; siliques subterete, acumi- 

 nate. — Stem erect, 2-5° high, simple or branched; leave^ very variable, on 

 slender petioles ; racemes virgate, elongated ; flowers nearly white ; siliques 



