EVENING PRIMROSE FAMILY. 283 



5. O. graciliflora II. & A. Acaulescent; pilose-pubescent; leaves erect or 

 ascending, linear, obscurely denticulate or commonly entire, 2> x /-2 in. long 

 or less; calyx-tube beyond ovary filiform, about 1 in. long, the segments hirsute- 

 pubescent ; petals broadly obovate, the broad shallow notch at apex with a 

 middle tooth or acumination, 3 to 4 lines long; capsule coriaceous. 



Foothills on both sides of the Sacramento Valley and southward to Mon- 

 terey. Apr. Petals often turning greenish or reddish. 



6. O. cheiranthifolia Hornem. Stems decumbent or mostly prostrate, radi- 

 ating from a central rosette crowning the taproot, l 1 /^ to 2% ft. long, rigid 

 and tough; leaves thick, canescently pubescent, obovate to oblong or oblong- 

 oblanceolate, obtuse, short-petioled or the uppermost sessile, y 2 to 1 in. long; 

 calyx-tube 1 to 2 lines long; petals 3 to 5 lines long, broader than long and 

 more or less truncate at apex; capsule acutely quadrangular or almost fluted, 

 stout, chartaceous, linear-oblong, % i n - long, spirally once coiled, the attenuate 

 apex mostly spreading; seeds in 1 row in each cell as in all the following. 



Drifting sandhills: Oakland, San Francisco and southward along the coast. 

 Flowering in summer, and more or less at all seasons. 



7. O. micrantha Hornem. Branches procumbent from a short primary axis, 

 not rigid or tough; pubescence hirsutulous; leaves oblong-lanceolate, 1% in. 

 long, slightly undulate, more or less denticulate; petals entire or emarginate, 1 

 to 2 lines long; capsule sharply 4-angled, 1 in. long, contorted, often coiled 

 into a single spiral, slightly attenuate upwards, sparsely hirsutulous, less 

 chartaceous than in the last. 



Along the coast from San Francisco southward. May-June. 



8. O. hirtella Greene. Simple or with simple branches from the base, the 

 branches suberect, flowering from the base or near it, 9 to 13 in. high, hispidly 

 hirsute; leaves round or oblong-ovate, subcordate, crenately toothed, crisped, 

 6 to 9 lines long, the radical oblong or oblong-spatulate, narrowed to a petiole, 

 1^4 in. long; petals 1 line long; capsule quadrangular, 8 lines long, contorted, 

 not spirally coiled or rarely, submembranous as in the next two species. 



Dry mountain ridges: Lake Co.; Vaca Mts. ; Mt. Diablo; Pajaro Hills. 

 May. This and the two species preceding have radical leaves in a tuft or 

 rosette, in this species disappearing rather early. The next two species are 

 without a radical rosette or tuft. 



9. O. strigulosa T. & G. Stems and branches slender, 4 to 10 in. high, 

 at first strict, at length diffusely branched; wholly glabrous or minutely pubes- 

 cent with short scattered hairs, the ovaries gray-pubescent; leaves linear, re- 

 motely low-denticulate, most of them i/> in. long; petals 1 to 2 lines long, yel- 

 low, aging to bright red; anthers innate; capsule linear, straight, % to 1% 

 in. long, 14 line wide. 



Co mm on throughout California, especially in sandy soil: Mendocino Co.; 

 Yuba Co.; Calistoga; Alameda; San Francisco; Southern California. May- 

 June. 



10. O. dentata Cav. Branched from the base, bushy, 9 in. high; sparsely 

 pubescent with short stiffish spreading hairs; leaves linear, mostly tapering to 

 both ends, denticulate, % to % in. long, often with smaller leaves fascicled in 

 the axils; petals yellow changing to dull red, round-obovate, 2 to 3 lines 

 long; anthers versatile; capsule similar to no. 9, 1 in. long, arcuate-recurved. 

 — (O. campestris Greene.) 



Antioch and common southward on the sandy San Joaquin plains. Apr.- 



