658 FLORA. 



3.7 cm. long, 4-sided, curved; seeds about 2 mm. long. Shores of the St. Law- 

 rence and along the Great Lakes, to Mass., southern N. Y. and Neb. Summer. 



8. OENOTHERA L. 



Usually low annual biennial or perennial caulescent herbs. Leaves alternate, 

 sinuate or pinnatifid. Flowers yellow, axillary, or sometimes in terminal spikes, 

 nocturnal; buds erect. Calyx-tube sometimes filiform; calyx segments deciduous. 

 Ovary 4-celled, elongated; ovules in 2 rows, ascending. Capsules usually narrowly 

 cylindric, sometimes slightly tapering, spreading or ascending. Seeds terete, 

 crowned by a tubercle. [Greek, wine-scenting, the roots being once used for that 

 purpose.] About 20 species, in N. Am. and western S. Am. 



Flowers axillary. 



Silvery-pubescent witlvappressecl or ascending hairs; seeds striate. 



i. OE. humifusa. 



Glabrous or sparingly hirsute-pubescent; seeds pitted. 2. OE. laciniata. 



Flowers in terminal bracted spikes. 3. OE. rhombipetala. 



1. OEnothera humifusa Nutt. SEASIDE EVENING-PRIMROSE. (I. F. f. 

 2581.) Spreading and decumbent, or ascending, branched from the base; stems 

 2-5 dm. long. Leaves acutish or sometimes obtuse at the apex, 1.2-5 cm - l n gj 

 repand-denticulate, the lower pinnatifid; flowers axillary, yellow, 12-20 mm. 

 broad; calyx-lobes somewhat spreading; capsule linear, 12-24 mm. long, about 

 3 mm. thick, very pubescent; seeds striate longitudinally. On sea-beaches, N. J. 

 to Fla. June-Sept. 



2. OEnothera laciniata Hill. SINUATE-LEAVED EVENING PRIMROSE. (I. F. f. 

 2582.) Decumbent or ascending, sometimes branched, 1-5 dm. high, glabrous or 

 sparingly hirsute pubescent. Leaves oval-lanceolate, oblong, or oblanceolate, 

 acute or obtusish at the apex, sinuate-dentate or often pinnatifid. 2.5-5 cm - l n g; 

 flowers axillary (or on small plants sometimes solitary and terminal), 12 36 mm. 

 broad; calyx-lobes reflexed; capsule linear, 2.5-3.5 cm. long, about 2 mm. thick, 

 more or less pubescent; seeds strongly pitted. In sandy dry soil, southern N. J. to 

 Penn., 111. and Neb., south to Fla., Tex. and Mex., extending into S. Am. May- 

 June. Naturalized in Vt. 



O nothera laciniata grdndis Britton. Similar to the species, but the leaves more 

 prominently toothed and the flowers 5-7 cm. broad. Mo. and Kans., south to Tex. 



3. OEnothera rhombipetala Nutt. RHOMBIC EVENING-PRIMROSE. (I. F. f. 

 2583.) Erect, finely and densely appressed -pubescent, 6-12 dm. high. Leaves linear- 

 lanceolate, sessile and rounded at the base or the lower narrowed into petioles, 

 acuminate at the apex, remotely denticulate, 5 10 cm. long; flowers 2.5-5 cm. 

 broad; calyx-lobes canescent; petals rhombic obovate; capsule columnar, curved, pu- 

 bescent, 12- 16 mm. long, about 2 mm. thick; seeds obovoid, tuberculate at the top. 

 On prairies, Minn, to Ind., Neb. and the Ind. Terr. June-July. 



9. ANOGRA Spach. (See Appendix.) 



Low annual or perennial canescent herbs, often with a papery bark. Leaves 

 alternate, usually pinnatifid. Buds drooping; flowers white or pink, usually axil- 

 lary, diurnal. Calyx-tube elongated. Ovary elongated; ovules numerous, in I row, 

 ascending. Capsules elongated, spreading or ascending, loculicidal. Seeds terete. 

 [Anagram of Onagra.~\ About 10 species, chiefly in southern N. Am. 



Tips of the calyx-segments not free in the bud. i. A. albicanlis. 



Tips of the calyx-segments free in the bud. 



Throat of the calyx-tube villous within. 2. A. coronopifoha, 



Throat of the calyx-tube glabrous within. 3. A. pallida. 



I. Anogra albicaulis (Pursh) Britton. PRAIRIE EVENING-PRIMROSE. 

 (I. F. f. 2584.) Diffusely branched; branches decumbent or ascending, more or 

 less hirsute or puberulent, whitish and often shreddy, 1-3 dm. long. Leaves ob- 

 lanceolate or lanceolate, deeply pinnatifid or the lowest repand-dentate (rarely en- 

 tire), 2.5-10 cm. long; flowers 3.5-7.5 cm. broad, white, becoming rose-color; 

 petals obcordate or emarginate; calyx-segments lanceolate, acuminate, hirsute; 



