Parrya. CRUCIFER^E. 151 



38. PLATYSP:&RMUM, Hook. (Gr. irXarv^, broad, and airiptxa, seed.) 

 — A single species, a slender early spring annual of the valleys of the Great 

 Basin — Fl. Bor.-Am. i. 68, t. 18, f. B. [By S. Watson.] 



P. SCapigerum, Hook. l. c. Scapes 1 to 6 inches high in fruit : leaves small, lyrately 

 pinuatifid with few lobes, often reduced to a single rhombic or ovate toothed or entire lobe 

 upon a slender petiole : Howers about a line long : petals varying from narrowly obovate to 

 linear-spatulate : pod 3 to 5 lines long, 8-12-seeded. — lu the dry interior region, from 

 Klikitat County, Wa.shington, to the Carson River, and eastward to the Clear Water, 

 Spalding, and Kootenai County, Idaho, Geyer. 



39. SELENIA, Nutt. (Gr. o-eXtjvr], the moon, in allusion to the near 

 relation of the genus to Lunar ia.) — Septum occasionally perforate or nearly 

 wanting. Seed-coats thick and sometimes separate. Species with golden yellow 

 flowers, blooming in spring. — Jour. Acad. Philad. v. 132, t. 6 ; Torr. & Gray, 

 Fl. i. 99 ; Gray, Gen. 111. i. 157. [By S. Watson.] 



S- aiirea, Nutt. 1. c. Branching usually from the base, a span high or less : leaves pinnati- 

 sect ; the narrow lobes entire or with one or two coarse teeth ; floral leaves similar : pedicels 

 ascending, a half to one inch long : sepals unappendaged : pod about six lines long and two 

 or three lines broad. — Torr. & Gray, 1. c. ; Hook. f. Bot. Mag. t. 6607. — On wet prairies, 

 from S. W. Missouri and S. E. Kansas to the Arkansas River. 



Var. aperta, Watson, n. var. Pedicels divaricate : pods broadly elliptical (6 to 8 

 lines long), with a style 4 to 6 lines long; septum reduced to a narrow margin. — S. aurea, 

 var. fi, Torr. & Gray, 1. c. ; Gray, 1. c. t. 67. — Near St. Augustine, Texas, Leavenworth. 



S. dissecta, Torr. Low (3 to 6 inches high), very leafy and flowering from the base : 

 leaves doubly pinnatisect : outer sepals much tlie larger, appendaged near the apex : pod 

 obloug-obovate, an iuch long or less and 5 or 6 lines wide ; the style 1 to 4 lines long : seeds 

 nearly 3 lines broad. — Pacif. R. Rep. ii. 160, t. 1. — In extreme Western Texas; near the 

 mouth of Delaware Creek, Capt. Pope, and prairies south of Ft. Davis, Dr. Havard. 



40. PARRYA, R. Br. ( Capt. W. E. Parry, upon whose first voyage for 

 the discovery of a northwest passage, in the years 1819-20, the species upon 

 which the genus was founded was collected.) — North American and Asiatic 

 perennials with branching caudex and naked scape-like peduncles, glabrous or 

 rough-pubescent. Ten Asiatic species are described, but they vary much in their 

 characters and several of them are imperfectly known. The genus is here 

 characterized according to the more typical species. — R. Br. in Parry, 1st Voy. 

 Suppl. to App. 268 ; Benth. & Hook. Gen. i. 67 ; Regel, Enum, PI. Semenov. 

 Suppl. ii. 20. [By S. Watson.] 



§ 1. Parrya proper. Stigma distinctly 2-lobed: seeds margined and cotyle- 

 dons strictly accumbent : scape naked. 



P. arctica, R. Br. Dwarf, glabrous : the slender branches of the caudex very short: leaves 

 short, linear-oblanceolate : scape becoming 2 or 3 inches high in fruit : pod oblong (6 to 9 

 lines long), obtuse, beaked by the very short nearly sessi}e stigmas, 6 to 8-seeded, spreading : 

 seeds with loose rugose testa. — R. Br. 1. c. 269, t. B. — Islands and coast of Arctic 

 America, east of the Mackenzie River. The Siberian specimens referred to this species by 

 Regel belong to the next. 



P. macrocarpa, R. Br. Caudex stout ; the branches usually covered with the remains of 

 dead leaves : leaves oblong- to linear-oblanceolate, 2 to 4 inches long including the long 

 petioles, usually coarsely and sharply toothed, glabrous or more or less rough-pubescent 

 throughout with short .stiff glandular hairs : scape 2 to 6 inches high : flowers lai-ge : pods 

 ascending, acute and beaked with slender style, an inch or two long, 6-8-seeded ; seeds. 



