OF ARTS AND SCIENCES: MAY 13, 1873. 579 



Spike simple ; floral and cauline leaves similar; fls. very- 

 small ; capsule linear, 4 - 6" long ; seeds smaller . . 67. CE. Torreyi. 



Glabrous ; spike simple ; leaves uniform ; capsules ovate- 

 oblong, 2-4" long ; placenta narrow .... 68. <E. glabella. 



§ 1. EUCENOTHERA, Torr. & Gray. Lobes of the stigma 

 linear, mostly elongated ; tube of the calyx linear, slightly dilated 

 at the throat ; petals mostly flabelliform, obcordate or obovate, 

 never lilac or purple ; filaments nearly equal, often declined ; an- 

 thers linear or linear-oblong, attached at the middle, versatile. 



* Annual or biennial caulescent herbs ; flowers erect before open- 

 ing, yellow, usually turning to rose-color, nocturnal ; tips of the 

 calyx-segments free in the bud ; capsule sessile, coriaceous, straight 

 or nearly so, subtetragonal, the valves somewhat ribbed ; seeds in 

 two rows in each cell. — Onagra, Tourn. 



t Flowers in a leafy spike ; capsule stout, oblong, slightly tapering 

 above ; seeds oblong, angled, nearly smooth, the angles more or 

 less margined. 



1. CE. biennis, L. Erect, usually stout and mostly simple, 1 - 5° 

 high, canescently puberulent and more or less hirsute or strigose ; 

 leaves lanceolate to oblong- or rarely ovate-lanceolate, 2-6' long, 

 acute or acuminate, repandly denticulate, the lowest petioled ; calyx- 

 tube rather slender, 1 - iy long ; petals \ — § ' long ; capsule more or less 

 pubescent or hirsute, 3" broad, 9 -12" long; seeds nearly 1" long. — 

 From lat. 56° to the Gulf, Texas, Nevada, and Oregon. The more 

 strigose form is CE. mitricata, Murr. ; the more softly pubescent is 

 CE. Oakesiana. The hairs often arise from a purple base. 



Yar. grandiflora, Lindl. Petals equalling the calyx-tube, 1 - 2J' 

 long. — Of equal range, but less common eastward. The broader 

 leaved form is CE. Lamarckiana, Ser. 



Var. niRSUTissniA, Gray. ( CE. Hookeri, Torr. & Gray.) Resem- 

 bling var. grandiflora, but more hirsute, especially upon the ovary. — 

 From New Mexico to California. 



Var. cruciata, Torr. & Gray. Flowers small, the petals very 

 narrow or wholly wanting. An eastern form. 



2. CE. Jamesii, Torr. & Gray. Resembling the last, but much 

 stouter and larger flowered. Stem 5-10° high, becoming thick and 

 woody at base ; pubescence appressed, canescently puberulent, with scat- 

 tered substrigose hairs ; spike becoming rather loose ; calyx-tube rather 

 thick, 3-5' long ; petals very broad, H - 2\' long ; capsule 1-2' long- 



