GENUS 21. 



MUSTARD FAMILY. 



169 



21. STANLEYA Nutt. Gen. 2: 71. 1818. 



Glabrous and glaucous, perennial tall mostly erect and branching herbs, with entire 

 toothed lobed or pinnately divided leaves, and large yellow bractless flowers in elongated 

 terminal racemes. Sepals linear, narrow. Petals narrow, long-clawed. Stamens 6, very 

 nearly equal; anthers twisted. Ovary short-stipitate ; style short or none. Siliques linear, 

 long-stipitate, spreading or recurving, somewhat compressed, dehiscent, the valves with a 

 strong midnerve. Seeds in i row in each cell, 

 numerous, pendulous. Cotyledons straight, in- 

 cumbent. [Named for Lord Edward Stanley, 

 President of the Linnaean Society.] 



About 3 species, of western North America, the 

 following typical. 



i. Stanleya pinnata (Pursh) Britton. 

 Stanleya. Fig. 2048. 



Cleome pinnata Pursh, Fl. Am. Sept. 739. 1814. 

 Stanleya pinnatifidaNutt. Gen. 2: 71. 1818. 

 Stanleya pinnata Britton, Trans. N. Y. Acad. Sci. 

 8: 62. 1888. 



Stems stout, 2-5 tall, sometimes decum- 

 bent. Lower leaves pinnatifid or pinnately 

 divided, or entire, 5 '-8' long, i'-3' wide, long- 

 petioled ; upper leaves similar, or less divided, 

 or narrowly oblong or lanceolate, entire, short- 

 petioled and narrowed at the base ; flowers nu- 

 merous, showy; petals 8-12" long; filaments 

 filiform, exserted; siliques 2'-$' long, about i" 

 thick, 2-3 times as long as their stipes, spread- 

 ing, downwardly curved, somewhat constricted 

 between the seeds when dry. 



In dry soil, South Dakota and Nebraska to Cali- 

 fornia, New Mexico and Arizona. Plant with the 

 aspect of a Cleome. May-July. 



22. THELYPODIUM Endl. Gen. 876. 1839. 



[PACHYPODIUM Nutt. 1838. Not Lindl. 1830.] 



Erect glabrate biennial or perennial herbs, with simple entire toothed or pinnatifid leaves, 

 and racemose purplish or white flowers. Siliques nearly terete, linear, with a short stipe in 

 some species; valves nerved, dehiscent; style short; stigma nearly entire. Seeds in I row 

 in each cell of the pod, oblong, marginless ; cotyledons obliquely incumbent. [Greek, female- 

 stalk, from the stiped ovary.] 



A genus of about 18 species, natives of North Amer- 

 ica. All but the following occur only in the western 

 part of the continent. Type species : Pachypodium 

 laciniatum (Hook.) Nutt. 



i. Thelypodium integrifolium (Nutt.) Endl. 

 Entire-leaved Thelypodium. Fig. 2049. 



Pachypodium integrifolium Nutt. ; T. & G. Fl. N. A. i : 



96. 1838. 

 Thelypodium integrifolium Endl.; Walp. Rep. i: 172. 



1842. 

 Pleurophragma integrifolium Rydb. Bull. Torr. Club 34 : 



433. 1907- 



Glabrous, erect, branching above, 3-6 high. 

 Leaves entire, thickish, the basal and lower ones 

 petioled, narrowly oval or oblong, 2'-4' long, the 

 upper or sometimes nearly all the cauline ones ses- 

 sile, linear, lanceolate or oblong-lanceolate, acute or 

 acuminate; flowers pink, in short dense racemes; 

 pedicels slender, spreading, 2"-^" long; petals obo- 

 vate or spatulate, long-clawed ; pods narrowly linear, 

 about i' long and i" wide; stipe i"-2i" long; style 

 slender, nearly i" long. 



Nebraska and Wyoming to Oregon, Utah and New 

 Mexico. July-Sept. 



23. ALLIARIA Adans. Fam. PI. 2 : 418. 1763. 



Biennial or perennial, sparingly pubescent or glabrous, erect branching herbs, with broad 

 dentate cordate or reniform leaves, and rather large racemose white flowers. Sepals short. 



