EVENING-PRIMROSE FAMILY 209 



or even reflexed ; sepals 1 mm. long, reflexed in anthesis ; petals white, turning to rose, 1 mm. 

 long ; stigma capitate ; capsule 4-8 mm. long, torulose ; seeds strigose-canescent, 1 mm. long. 



Dry places, Transition Zone; Washington to southern California and Montana. Type locality: "near Julian, 

 San Diego County, California." July-Sept. 



Gayophytum lasiospermum var. HoffmSnnii Munz, Amer. Journ. Bot. 19: 774. 1932. Upper parts puber- 

 ulent with short spreading hairs. Occasional, dry slopes, Transition Zone; Mount Hood, Oregon, to southern 

 California. Type locality: Staufler Postoffice, Mount Pinos, Ventura County, California. 



5. Gayophytum eriospermum Coville. Coville's Gayophytum. Fig. 3449. 



Gayophytum eriospermum Coville, Contr. U.S. Nat. Herb. 4: 103. 1893. 

 Gayophytum lasiospermum var. eriospermum Jepson, Man. Fl. PI. Calif. 689. 1925. 



Plants 2-5 dm. tall, branching freely, the branches ascending, appressed-puberulent above. 

 Leaves linear to lance-linear, 5-30 mm. long, entire, 1-3 mm. wide ; pedicels 4-8 mm. long ; sepals 

 3 mm. long ; petals 3-5 mm. long, white, turning to rose ; stigma capitate ; capsules torulose, 4-7 

 mm. long ; seeds strigose-canescent, 1 mm. long. 



Rare, dry places, Transition Zone; Oregon and Idaho to southern Sierra Nevada, California. Type locality: 

 east fork 'of Kaweah River, Tulare County, California. Aug-Sept. 



6. Gayophytum racemosum Terr. & Gray. Black-foot Gayophytum. Fig. 3450. 



Gayophytum racemosum Torr. & Gray, Fl. N. Amer. 1: 514. 1840. 



Plants low, 1-2 dm. high, subsimple to repeatedly branched from the base, the ultimate 

 branches leafv and relatively simple, strigillose or subglabrous. Leaves linear to linear-oblanceo- 

 late, 1-3 cm. long; pedicels from almost none to 2 mm. long, erect; sepals 0.5 mm. long; petals 

 white, turning red, scarcely 1 mm. long; capsule subterete, narrowly linear, not torulose, erect, 

 6-14 mm. long ; seeds erect, glabrous, 1 mm long. 



Dry slopes and flats. Transition Zone; Washington to southern California, Montana, Colorado, and Ari- 

 zona, type locality: "Near Black- Foot River," Idaho. July-Aug. 



Gayophytum racemosum var. caesium (Torr. & Gray) Munz. Amer. Journ. Bot. 19: 776. 1932. {Gayophy- 

 tum caesium Torr. & Gray, Fl. N. Amer. 1: 514. 1840.) Whole plant, or at least the upper portion, with 

 minute short spreading hairs. Not common. Transition Zone; Washington to central California and Nevada. 

 Type locality: near Walla Walla, Washington. 



7. Gayophytum Helleri Rydb. Heller's Gayophytum. Fig. 3451. 



Gayophytum Helleri Rydb, Bull. Torrey Club 40: 65. 1913. 

 Gayophytum Helleri var. erosulatum Jepson, Man. Fl. PI. Calif. 689. 1925. 



Plants 1-3 dm. high, the stems with strict nearly erect branches, puberulent with short 

 spreading hairs. Leaves linear, 5-20 mm. long, soft hirsutulous ; sepals and petals scarcely 

 1 mm. long ; fruiting pedicels about 1 mm. long ; capsule narrowly linear, not torulose, 8-10 mm. 

 long, subsessile, hirsutulous ; seeds 1 mm. long, appressed-canescent. 



Occasional, dry places, Transition Zone; Washington to southern California and Idaho. Type locality: 

 Forest, Nez Perces' County, Idaho. July-Aug. 



Gayophytum Helleri var. glabrum Munz, Amer. Journ. Bot. 19: 777. 1932. Plant quite glabrous. Occa- 

 sional, Washington to central California, Idaho, and Colorado. Type locality: Silver City, Owyhee County. Idaho. 



8. Gayophytum hdmile Juss. Low Gayophytum. Fig. 3452. 



Gayophytum humile Juss. Ann. Sci. Nat. 25: 18. pi. 4. 1832. 

 Gayophytum pumilum S. Wats. Proc. Amer. Acad. 18: 193. 1883. 



Low, 5-15 cm. high, glabrous, branched from base, the branches relatively simple. Leaves 

 linear to lance-Hnear, 1-3 cm. long, entire, on short petioles, upper ones somewhat reduced, but 

 quite well developed; pedicels scarcely evident; sepals 1 mm. long; petals white, 1 mm. long; 

 capsule flattened, not torulose, erect, 10-15 mm. long; seeds obliquely placed m capsules, 0.6 

 mm. long. 



Occasional, dry places, Transition Zone; Washington, and Idaho, to southern California; also Chile. Type 

 locality: Chile. July-Aug. 



Gayophytum humile var. hirtellum Munz, Amer. Journ. Bot. 19: 778. 1932. Plant puberulent with short 

 spreading hairs. Rare and local. Transition Zone, eastern central California and adjacent Nevada. Type locality: 

 Snow Valley, Ormsby County, Nevada. 



10. GAURA L. Sp. PI. 347. 1753. 



Caulescent herbs, annual to perennial. Leaves alternate. Flowers white or pink, in 

 terminal racemes or spikes. Hypanthium narrow and short ; sepals 4. deciduous. Petals 4, 

 clawed. Stamens 8, usually with scale-like appendage at base of each filament. Ovary 

 4-celled. usually with single ovule in each cell. Stigma 4-lobed, with cup-like border at 

 base. Capsule nut-like, obovoid, nearly or quite indehiscent, 1-4 seeded. [Name Greek, 

 meaning proud, some species being showy.] 



A genus of 18 species of the temperate parts of North America and Argentina. Type species, Gaura biennis L. 



Anthers oval, attached near middle; leaves 1-3 cm. wide, 5-10 cm. long; plants 5-20 dm. tall, biennial; fruit almost 

 equally 8-ribbed, glabrous. '• G- parviflora _ 



Anthers linear, attached near the base; leaves 0.3-1 cm. wide, 1-4 cm. long; plants 1-5 dm. tall, perennial; fruit 

 4-angled, pubescent. 2. G. cocctnea. 



