EVENING-PRIMROSE FAMILY 205 



each side the tip, entire, sessile or nearly so, 5-20 mm. long; flowers axillary, pinkish white; 

 pedicels 5-8 mm. long, capillary; hypanthium 1.2 mm. long; sepals 1.5-2.5 mm. long; petals 

 obcordate, equalling sepals ; stamens unequal ; capsules cylindric-clavate, slightly curved, erect, 

 10-16 mm. long, attenuate at base; seeds oblong, 1.5 mm. long, brownish, flattened, bordered 

 with a revolute, wing-like margin which is "minutely tubercled with cellular processes." 



Rare, dry places, Upper Sonoran Zone; Harper Ranch, eastern Orecon, to Inyo County, California, and Utah. 

 Type locality: foothills. Trinity Mountains, northwestern Nevada. May-June. 



31. Oenothera cardiophylla Torr. Heart-leaved Primrose. Fig. 3438. 



Oenothera cardiophylla Torrey, Pacif. R. Rep. 5: 360. 1858. 



Oenothera cardiophylla var. pctiolaris M. E. Jones, Proc. Calif. Acad. II. 5: 682. 1895. 



Chylismia cardiophylla Small, Bull. Torrey Club 23: 193. 1896. 



Annual to suff'rutescent perennial, 1-5 dm. tall, erect, usually freely branched, occasionally 

 simple, typically soft-pubescent throughout, but varying from glabrate to white-villous, the stems 

 fairly coarse. Leaves orbicular-cordate to ovate, irregularly dentate or denticulate, obtuse, some- 

 what bicolored, subglabrate to white-villous, well distributed, 1-6 cm. long, almost as wide, on 

 petioles 1-7 cm. long ; flowers borne singly in axils of reduced upper leaves or more commonly 

 in dense terminal racemes ; hypanthium 5-10 mm. long ; sepals ovate, 3-7 mm. long ; petals a 

 clear yellow, turning red with age, broader than long, 6-8 mm. long ; stamens unequal ; capsules 

 rather coarse, cylindrical, usually slightly curved, 2-6 cm. long, on pedicels 2-10 mm. long ; seeds 

 obovoid, brown, somewhat irregularly angled, 0.6 mm. long. 



Desert mesas and canyons. Lower Sonoran Zone; Inyo County, California, to northern Lower California 

 and western Arizona. Type locality: near Yuma, Arizona. March-May. 



Oenothera cardiophylla var. splendens Munz & Jtn. Bull. Torrey Club 49:354. 1923. {Oenothera 

 cardiophylla var. longituba Jepson, Man. Fl. PI. Calif. 686. 1925.) Flowers larger, hypanthium 20-35 mm. 

 long; petals 13-25 mm. long. With the species but more restricted in range, from Needles, California, to Yuma, 

 Arizona. Type locality: Needles, San Bernardino County, California. 



32. Oenothera kernensis Munz. Kern County Evening Primrose. Fig. 3439. 



Oenothera kernensis Munz, Amer. Journ. Bot. 18: 737. 1931. 



Annual, erect, with few spreading branches from the base, 8-12 cm. tall, somewhat canescent 

 throughout, minutely glandular-pubescent in inflorescence. Leaves well distributed, the basal ones 

 oblanceolate, 10-15 mm. long, 3-5 mm. wide, almost sessile, obtuse or acute, subentire or denticu- 

 late ; cauline leaves somewhat reduced, lance-linear ; flowers few, solitary in upper axils in a lax 

 raceme ; hypanthium 2-3 mm. long ; sepals lanceolate, reflexed, 5-6 mm. long ; petals bright yellow, 

 obovate, 1 cm. long; stamens of two lengths; stigma globose; capsule ascending, somewhat 

 curved, cylindric-clavate, 2-2.5 cm. long, 1-1.5 mm. thick, not beaked, pubescent, on a pedicel 

 4-6 mm. long. 



Dry slopes, at 4,000-5,000 feet, Upper Sonoran Zone; east side of Walker Pass, the type locality, Kern 

 County, California. May. 



33. Oenothera brevipes A. Gray. Desert Primrose. Fig. 3440. 



Oenothera brevipes A. Gray, Pacif. R. Rep. 4: 87. 1857. 

 Chylismia brevipes Small, Bull. Torrey Club 23: 194. 1896. 



Annual, frequently rather coarse, usually 1- to few-stemmed from base, occasionally branched 

 above, spreading-villous, especially below, 1-4 dm. tall, erect with nodding stem-tips. Leaves 

 largely in basal rosettes with few scattering smaller ones on lower stem, the uppermost reduced 

 to bracts, lower ones petioled, glabrate to villous, usually bicolored, with conspicuous reddish 

 veins beneath, ovate to oblong-cordate, subentire to pinnate or pinnatifid ; inflorescence racemose ; 

 pedicels short, 3-15 mm. long; hypanthium 3-7 mm. long; sepals 6-10 mm. long, pilose and 

 glandular; petals bright yellow, obovate, 7-15 mm. long; stamens subequal, the anthers vvith scat- 

 tered hairs ; capsule linear, spreading-divaricate, 5-9 cm. long, 2-3 mm. in diameter ; seeds straw- 

 colored, obovoid, 1-1.5 mm. long, somewhat angled. 



Open deserts, Lower Sonoran Zone; southern California to adjacent Arizona and Nevada. Type locality: 

 Colorado River. March-May. 



Oenothera pallidula Munz, Leaflets West. Bot. 2: 88. 1938. (Oenothera brevipes yar palliditla Munz, 

 Amer. Journ. Bot. 15: 229. 1928.) Like Oenothera brevipes, but with no spreading hairs, the stems glabrate 

 to finely canescent; sepals glandular-pubescent to canescent; capsules 1-1 .5 mm. in diameter. Death Valley to 

 Riverside County, California, eastward to Utah. Type locality: Las Vegas. Nevada. 



34. Oenothera multijuga var. parviflora (S. Wats.) Munz. Pinnate-leaved 



Primrose. Fig. 3441. 



Oenothera brevipes var. parviflora S. Wats, ex Parry, Amer. Nat. 9: 271. 1875. 

 Chylismia parviflora Rydb. Fl. Rocky Mts. 603, 1064. 1917. 

 Oenothera scapiodea var. tortilis Jepson, Man. Fl. PI. Calif. 687. 1925. 

 Oenothera multijuga var. parviflora Munz, Amer. Journ. Bot. 15: 231. 1928. 



Annual, glabrate to closelv fine-pubescent or villous, slender, l_-stemmed and erect, or 

 branched especially above, 2-8' dm. tall. Leaves in a basal rosette, pinnate with 5-8 pairs of 

 major lateral pinnae and a larger terminal one, usually quite villous, and with conspicuous red- 

 dish veins beneath; upper parts of plant quite leafless ; the inflorescence of naked racemes which 

 may be in a loose open panicle ; pedicels capillary, 1-2 cm. long ; sepals 3-4 mm. long ; petals 



