246 ONAGRACEAE. 



4. G. dudleyana. Abrams. Stems erect, simple below, more or 

 less branched above, 3-6 dm. high; herbage puberulent throughout 

 with rather short curved hairs; leaves linear-lanceolate, entire 

 or rarely faintly and remotely repand-denticulate; flower-buds 

 drooping, elliptic-ovate, tapering above to a rather long acuminate 

 tip, 10-15 mm. long; calyx-tube 1.5-2 mm. long; petals obovate, 

 truncate at the apex, abruptly tapering near the base to a short 

 (2 mm. long) and narrow claw, 15-20 mm. long, pink, often with 

 purple specks below the middle; stamens slightly unequal, the 

 longest 12 mm. long, anthers yellow; style filiform, glabrous, 12-14 

 mm. long; stigma-lobes oblong, 1.5 mm. long, yellow; capsule linear, 

 abruptly tapering at base to a short pedicel, and at the apex to a 

 slender beak, about 2.5 cm. long, each cell laterally bicostate. 



Frequent in the upper portions of the chaparral belt of the San 

 Gabriel Mountains. 



5. G. epilobioides (Nutt.) Wats, Stems slender, somewhat 

 branched above, 3-5 dm. high, glabrous or nearly so; leaves linear 

 or linear-lanceolate; calyx-tube 4-6 mm. long; petals cream-colored 

 or rarely faintly tinged with rose, 8-10 mm. long, rounded at apex 

 or somewhat acutish; stigma-lobes short; capsule 15-25 mm. long, 

 acuminate at apex, attenuate at base to a short base or nearly 

 sessile, not costate. 



Common in the chaparral belt, especially toward the coast. 

 First collected by Nuttall at San Diego. 



7. OENOTHERA L. 



Annual or biennial caulescent herbs with mostly erect 

 stems. Leaves alternate, undulate or toothed, sessile 

 or somewhat petioled. Flowers 3^ellow, nocturnal, in 

 terminal spikes. Calyx-tube elongated, terete, gradually 

 enlarged at the throat; the segments narrow, the tips 

 free in the bud. Petals 4, spreading. Stamens many, 

 equal in length ; filaments filiform ; anthers linear. Ovary 

 4-celled; styles united, filiform; stigma 4-cleft; ovules 

 numerous, in 2 or more rows, horizontal. Capsule 4- 

 celled, 4-angled, more or less tapering, loculicidally 

 dehiscent. Seeds more or less prismatic-angled. 



1, O. hookeri T. & G. Biennial; stem reddish, stout, angular, 

 1-2 m. high, herbage canescently pubescent and somewhat villous; 

 leaves lanceolate, sessile, acute, obscurely denticulate, calyx-tube 

 3 cm. long; the segments nearly as long; petals about 4 cm, long, 

 obcordate, pale yellow, turning to rose color; stigma-lobes yellow, 

 spreading; capsule 2 cm, long, sessile, canescent with a fine close 

 pubescence; seeds brown, 1 mm, long, faintly striate, not wing- 

 angled. (Oenothera biennis hirsutissima Gray,) 



Frequent in moist ground, usually along streams, both in the 

 valleys and mountains. May-August. 



