142 CRUCIFER^. Greggia. 



30. GREGG-IA, Gray. (Dedicated to Dr. Josiah Gregg, an active botanical 

 explorer, who lived in the first half of the century, and collected chiefly in 

 Northern Mexico.) — A genus essentially of the S. W. United States, a single 

 species being South American. Branching plants, somewhat frutescent at base. 

 — PI. Wright, i. 8, t. 1, & ii. 13, also referred to but unnamed in PI. Fendl. 

 116; Benth. & Hook. Gen. i. 80; Prantl, 1. c. 193; not of Gasrtn. nor Engelm. 

 Parrasia, Greene, Erythea, iii. 75. [By B. L. Robinson.] 



G. camporum, Gray. Stellate-cauescent, much branched from the base, a span to a foot 

 high, leafy : leaves obovate to oblauceolate, shallowly few-toothed, or less frequently pinna- 

 tifid, narrowed to a slender base or winged petiole : racemes terminal, at first dense, becom- 

 ing lax ; pedicels widely spreading, often curved downward, 2 to 6 lines long : flowers light 

 yellow, changing to purple : sepals linear or oblong-lanceolate, exceeded by the broad petals 

 (4 lines long) : capsule 6 to 12 lines in length, 1^ to 2\ lines broad, straight or curved 

 upwards. —PI. Wright, i. 9, t. 1, & ii. 13; Torr. & Gray, Pacif. R. Rep. ii. 159; Torr. Bot. 

 Mex. Bound. 37 ; Coulter, Contrib. U. S. Nat. Herb. iv. 20. Parrasia camporum, Greene, 

 1. c. — Dry table-lands and calcareous hills of S. W.. Texas. 



Var. angustifolia, Coulter, 1. c. Leaves narrower, linear to linear-oblong, entire 

 or subentire. — Occurring with and passing freely into the type. Abundant material of the 

 narrow-leaved form seems to show a complete transition to G. Unearifolia, Wats. Proc. Am. 

 Acad. xvii. 321 (Parrasia Unearifolia, Greene, 1. c. ), which can scarcely be maintained as 

 a species, since equally narrow pods and short styles are to be found with typical foliage of 

 G. camporum. 



31. HfiSPERIS, Tourn. Rocket. ("Eo-Trepa, evening, the flowers being 

 thought more fragrant at that time.) — Attractive plants with flowers large and 

 showy for the order and sometimes fragrant. Natives of the northern temperate 

 regions of the Old World. — Inst. 222, t. 108 ; L. Gen. no. 588 ; DC. Prodr. 

 i. 188; Reichenb. Ic. Fl. Germ. ii. t. 57-59. — One species often cultivated 

 in country gardens has become locally established in America. [By B. L. 

 Robinson.] 



H. matronAlis, L. (Dame's Violet.) Tall erect pubescent biennial or perennial with 

 slender terete subsimple stem : leaves lanceolate, acuminate, or ovate-lanceolate, acutish, 

 denticulate ; the upper short-petioled or subsessile ; the lower lougpetioled and sometimes 

 pinnatifid toward the base : petals purple, 8 to 10 lines long, much exceeding the erect 

 oblong sepals : capsules slender, ascending, nodulose, attenuate, becoming 4 inches in 

 length.— Spec. ii. 663; Hook. Fl. Bor.-Am. i. 59; Torr. & Gray, Fl. i. 90; Wats. & Coulter 

 in Gray, Man. ed. 6, 71. — Roadsides, &c. ; fl. April to August. (lutrod. from Eu., Asia.) 



32. ERYSIMUM, Tourn. Treacle Mustard. (Classic Greek epijo-f/iov, 

 the name of a garden plant.) — A large genus, chiefly of the Old World, here 

 combined with Cheiranthus, from which it has been commonly but very unsatis- 

 factorily separated by its supposedly incumbent cotyledons, the accumbent posi- 

 tion being assumed for the latter genus. However, as the cotyledons are not 

 infrequently oblique and in some cases even vary from almost accumbent to in- 

 cumbent in the seeds of the same capsule, this character cannot form a basis for 

 generic division in the presence of much habital similarity and default of other 

 technical differences. —Inst. 228, t. Ill ; L. Gen. no. 545 ; DC. Syst. ii. 490, & 

 Prodr. i. 196 ; Gray, Gen. 111. i. 149, t. 63 ; Reichenb. Ic. Fl. Germ. ii. t. 62-70; 

 Gay, Erys. Nov. Diag. ; Benth. & Hook. Gen. i. 79 ; Prantl, 1. c. Cheiranthus 



