EVENING PRIMROSE FAMILY 605 



(1917). 0. mulUjuga var. parviflora Munz, Am. Jour. Bot. 15:231 (1928). 0. scapoidea var. 

 tortilis Jepson, Man. 687 (1925), type loc. Wild Eose Canon, Panamint Eange, Jepson 7131. 



29. 0. heterochroma Wats. (Fig. 266.) Stems stout, 1^4 to 1% feet high, 

 the branches slender or even filiform ; leaves chiefly sub-basal but not in a rosette ; 

 leaf -blades elliptic to round-ovate, denticulate, sometimes subcordate at base, 1 

 to 2% inches long; petioles 1 line to 1% inches long; flowers in a panicle with 

 slender racemose branches; petals purplish, I14 to 2% lines long; anthers about 

 % as wide as long; capsules 6 lines long, 1 to li/4 lines wide. 



Dry valleys, 4000 to 6000 feet : Inyo Co. East to Nevada. 



Locs. — Crooked Creek, Owens Valley (Am. Jour. Bot. 15:239). Nev. : Soda Springs Canon, 

 Mineral Co., ShocTcley 561. 



Eefs. — Oenothera heterochroma Wats. Proc. Am. Acad. 17:373 (1882), type loc. Cande- 

 laria, Nev., ShocJcley 19. Chylismia heterochroma Small, Bull. Torr. Club 23:193 (1896). 0. 

 hrevipes race parryi Levi. Monog. Onoth. 146 (1904) in part. 



9. GAYOPHYTUM Juss. 



Slender erect annual herbs. Leaves alternate, or the lower opposite. Flowers 

 borne in leafy racemes. Calyx-tube none. Sepals 4. Petals 4. Stamens 8, the 

 alternate 4 short. Ovary 2-celled; stigma capitate. Capsule 4-valved, pediceled. 

 Seeds numerous, in a single row in each cell, naked. — Species 9, western North and 

 South America. (C. Gay, author of the Flora Chileiia, and Greek phyton, plant.) 



Bibliog. — Trelease, W., Eevision of the N. Am. species of Gayophytum (Eep. Mo. Bot. Gard. 

 5:107-116, pis. 17-22,-1894). Munz, P. A., The genus Gayophytum (Am. Jour. Bot. 19:768- 

 778, — 1932). Leveille, H., Monographie du genre Onothera: groupe des Prismatiformes (Toru- 

 losae), 164-174 (1904). 



Pedicels % to as long as the capsules ; branches with scattered leaves ; capsules clavate or oblong, 

 mostly torulose, obscurely if at all flattened ; seeds erect or suberect. 

 Style a little dilated upwards, truncate at apex, the stigma discoid; seeds glabrous, smooth or 

 minutely roughened. 



Corolla 4 to 5 lines wide; petals white, aging pink 1. G. diffusum. 



Corolla 1% to 2 lines wide; petals white, aging brick-red 2. G. ramosissimum. 



Style ending in a globose stigma ; seeds covered with short sub-appressed hairs. 



Herbage glabrous or nearly so ; petals entire 3. G. lasiospermum. 



Herbage grayish-puberulent ; petals erosulate 4. G. helleri. 



Pedicels almost none or very short ; branches rather densely leafy ; stigma capitate ; seeds glabrous. 



Capsules narrow-linear, more or less torulose ; seeds erect or suberect 5. G. caesium. 



Capsules oblong, strongly flattened, not at all torulose ; seeds obliquely ascendiag..6. G. humile. 



1. G. diffusum T. & G. Stems profusely branched from or above the base, 

 % to 2 feet high, glabrous or with scattered spreading hairs, more or less purplish; 

 bark becoming papery and tending to exfoliate; leaf -blades linear or the lower 

 linear-oblanceolate, glabrous or sparsely strigose, 5 to 8 lines long or the lower 1 

 to 2 inches long; flowers loosely disposed along the branchlets, strongly heliotropic; 

 calyx-lobes ultimately reflexed in pairs; petals rhomboidal-ovate, white, turning 

 pink or rose-color, 2 small yellow dots at base, (l^/^ or) 2 to 3 lines long; ovary 

 canescent to glabrous ; style a little dilated above the middle, truncate at apex, the 

 stigma discoid ; capsules at maturity more or less shrunken-constricted about the 

 seeds and thus torulose, borne on filiform pedicels 1 to 3 lines long. 



Dry open ridges or flats, 3800 to 8500 feet: Tehachapi Mts.; Sierra Nevada 

 from Tulare Co. to Siskiyou Co.; Santa Lucia Mts.; Humboldt Co. East to Ne- 

 vada, north to Washington and Wyoming. June- Aug. 



Locs. — Tehachapi Mts.: Breckenridge Mt., Bauer 5. Sierra Nevada: South Fork Middle 

 Tule Eiver, Jepson 4875 ; Garfield Big Trees, Tulare Co., Jepson 4658 ; Bound Mdw., Giant Forest, 

 Jepson 685; Simpson Mdw., Middle Fork Kings Eiver, Henrietta Eliot; Line Creek, Huntington 

 Lake, Jepson 13,082; Yosemite, Alice King; Kennedy Mdws., Tuolumne Co., A. L. Grant 225; 

 Dorrington, Calaveras Co., Jepson 10,049; Panther Creek, Amador Co., Hansen; Truckee, H. M. 

 Evans; West Branch, Butte Co., Cleveland; Susanville, Pearl Safford; Goosenest foothills, e. 

 Siskiyou Co., Butler 1630. Santa Lucia Mts.: Tassajara Eoad, Monterey Co., Hall 10,078. Hum- 

 boldt Co., Chesnut 4" Drew. 



