604 ONAGRACEAE 



the same size, ovate, 2-3 cm. long, glabrous, veiny, sharply serrate; free tube of 

 hypanthium 3 mm. long: petals yellow, about 1 cm. long; pod linear, spreading. 

 O. multijuga S. Wats. Dry places: s Utah. Mr. 



20. STENOSiPHON Spach. 



Perennial herbs, with erect leafy stem. Leaves alternate, sessile, narrow. 

 Flowers perfect, in elongate terminal spikes. Hypanthium much produced 

 beyond the ovary into a filiform tube. Sepals 4, reflexed. Petals white, clawed. 

 Stamens S, declined, without scales at the base. Ovary 1-celled; stigma 4-lobed, 

 surrounded by a cup-like border. Fruit 8-ribbed, indchiscent, 1-celled, 1-seeded. 



1. S. linifolium (Nutt.) Britton. Stem slender, glabrous, 6-15 dm. high; 

 leaves lanceolate to linear, 2.5-5 cm. long, entire, acuminate; spikes elongate, 

 sometimes 3 dm. long; tube of the hypanthium about 1 cm. long; petals white, 

 long-clawed, about 5 mm. long; fruit ovoid, hirsutulous, rugose, 3-4 mm. long. 

 Dry plams and prairies: Neb.— Ark.— Tex.— Colo.; Mex. Jl-S. 



21. GAURA L. Butterfly Weed. 



Annual, biennial, or perennial caulescent herbs, with branching stems. 

 Leaves alternate, usually narrow. Flowers perfect, in terminal racemes or pan- 

 icles, or spikes. Hypanthium prolonged beyond the ovary into a slender but 

 short tube. Sepals 4, rarely 3. Petals clawed, unequal. Stamens usually 8, 

 declmed, with a small scale at the base of the filament. Ovary 4-celled; style 

 declined; stigma 4-lobed, with a cup-like border below. Fruit nut-like, inde- 



hiscent, ribbed or angled, 4-celled, but some of the cells usually empty. Seeds 

 1-4. 



2. G. neomexicana. 



Anthers oval, attached near the middle; fruit fusiform, sessile, almost equally 8-ribbed. 



. ., ■,. , 1. G. parviflora. 



Anthers Imear or nearly so, attached near the base; fruit strongly 4-angled, at least 



above. o ^ o 



Fruit sessile, broadly fusiform; taU biennials. 

 Fruit prolonged below into a stipe-Uke base. 



Stipe-like base slender; fruit fusiform; tall herbaceous plant. 3. G. color adensis. 



Stipe-hke base thick; body of the fruit pyramidal-ovoid; low plants, with subhg- 



neous base. 



Plants more or less pubescent. 



Leaves canescent, the lower usually oblong and sinuately toothed. 



_ . 4. G. coccinea, 



Leaves sparmgly strigose, all linear or nearly so and entire. 



^, ^ , ^ 5. G. parvifolia. 



Plant glabrous or nearly so, except the strigose hypanthium. 



6. G. glabra, 



1, G. parviflora Dougl. Biennial; stem 6-15 dm. high, silky-pilose, wath 

 long spreading hairs; leaves lanceolate, ovate-lanceolate, or elliptic, 3.5-10 cm. 

 long, acute or acuminate, repand-dentate, softly pilose; spike very long; petals 

 2.5-4 mm. long; fruit 6-8 mm. long, glabrous or nearly so. Plains, valleys, and 

 praines: S.D.— Mo.— La.— Ariz.— Wash.; Mex. Plain— Suhmont My-0. 



2. G. neomexicana Wooton. Perennial; stems usually more than one from 

 the woody root, 4-7 dm. high, villous, somewhat glandular in the inflorescence; 

 leaves lanceolate, 5-10 cm. long, entire or sinuately toothed; flowers sessile; tube 

 of hypanthium 1 cm. long; petals 1 cm. long, rose-pink; fruit obo void-pyramidal, 

 7-8 mm. long, 3-4 mm. broad, sessile. Valleys: N.M.— Colo. SubmoiiL Je. 



3, G. coloradensis Rydb. Herbaceous biennial or 

 form root; stem 5-7 dm. high, strict, but somewhat bra......v., ....^^ -^"*^— , 



more or less red; leaf-blades narrowly oblanceolate, 5-10 cip. long, gradually 

 tapering below mto a short petiole, or the upper sessile, callous-denticulate, 

 finely stngose; hypanthium about 2 cm. long, finely strigose; pfetals about 8 mm. 

 long, spatulate, pmk; fruit 8-10 mm. long. Meadows: Colo. SubmonL Jl. 



4. G. coccinea Nutt. Stems several, branched, strigose or puberulent and 

 more or less hirsute, 1-5 dm. high; leaves numerous, sessile, oblong or lanceolate, 

 the upper Unear-lanceolate, repand-dentate or entire, 1-3.5 cm. long, canes- 

 cent; tube of h;>7)anthium 6-8 mm. lone: petals from nink or white to scarlet. 



perennial 



