600 ONAGRACEAE 



X nrodi oi tne nypantnium dark ptirple within, 5-6 mm. broad at the mouth. 



"^^tht sfameni''^''^^'^.?.?^^? .T"^^' sometimes with a darker rinf at"\l?blse of 

 Tjne stamens, ^-4 mm. broad at the mouth. 2. A/, serrulata. 



1. M. melanoglottis Rydb. Perennial, shrubby and branched at the 



base; stems 2.a-4 dm. high, the upper portion as well as the leaves grayish 



strigose, -^leaf-blades spatulate to ahnost hnear, 2.5-6 cm. long, shallowly serrate; 

 petals 10-12 mm. lone-: cansnlp strnio-lif 9 nrv. i^,^,, „„^;^,,„u, „,.u„„„„„i. t-i_ ' 



soil: Tex.— Colo. Plain. 



Dry 



serruiata (rsutt.) Walp. Perennial, woody at the base; stem 1-5 



branched and leafy, more or less canescent; leaf-blades spatulate to 



iUg or Imear, 2-0 cm. long, serrate, canescent-strigose ; petals obovate, 



A \^' ^errulata (Nutt.) Walp. Perennial, woody at the base; stem 1-5 



dm. high rir<ln/iKQr? o.i,1 I««f,r ,«„„„ „_ 1 - / , . /■ , ■ , ' . , . 



8-12 mm. ong, crenulate; capsule 1.5-2 cm. long. Oenothera serrulata Nutt. 

 j2aS° "^ Man.— Mo.— Tex.— Ariz.— Alta. Plain— Suhmonl. 



17. TARAXIA Nutt. 



Acaulescent perennial herbs, with a short caudex. Leaves crowded at the 

 base, pmnatihd or entire. Flowers perfect, regular, axillary. Hypanthium 

 prolonged beyond the ovary into a slender cylindric tube, marcescciit. Petals 

 4, yellow or white. Stamens 8. Stigma capitate, entire or 4-toothed. Capsule 

 sessile, oblong, 4-winged. Seeds in a double row in each cell of the ovary. 



Leaves entire or merely toothed. 

 Leaves pinnatilid. 



1. T. subacaulis. 



Hypanthium G-10 cm. long; petals 10-14 mm. long! 3. T. lonaiflora 



5-1 



3. T. longiflora. 



1. T. subacaulis (Pursh) Rydb. Acaulescent perennial; leaves oblance- 

 oiate or lanceolate, 7-lo cm. long, entire or repand, glabrous; tube of hvpanthium 

 d-4 5 cm long, slender ; petals pale yellow, 8-12 mm. long; capsule ovate-ellip- 



ni' ?^iv™"o?^- Oenothera heterantha Nutt. Plains and valleys : Mont.— 

 Colo.— Calif. Submont. Je-Au. 



2. T. breviflora Nutt. Acaulescent perennial; leaves deeply pinnatifid, 

 2 cm. long nunutely pubescent; sepals and yeUow petals about 5 mm. long; 



capsule about 1.5 cm. long, lance-ovoid, tuberculate. O. breviflora T. & G. 

 Plains and valleys: Alta.—Wyo.— Utah— B.C. Plain-Submont. Je-Au. 



3. T. longiflora Nutt. Acaulescent perennial; leaves narrowly oblance- 

 oiate m outline, sinuately pinnatifid to near the midrib, 8-15 cm. long, sparsely 

 strigosc; sepals narrowly lance-oblong, 8 mm. long; petals emarginate or rounded, 

 yenow; capsule lance-ovoid, round-ridged. 0. Nuttallii T. & G. T. tikurana 

 A. Nels. Meadows: Cahf.— Ida.— Wash. Submont. Jt^Au. 



18. SPHAEROSTIGMA F. & M. 



Annual or perennial caulescent herbs. Leaves alternate, entire or pinnatifid. 

 flowers small or minute, in bracted or leafy spikes. Hypanthium produced 

 beyond the ovarj- mto an obconic short tube. Sepals 4. Petals 4, yellow, wliite, 

 or pink, entire or emarginate. Stamens 8, slightly unequal. Stigma capitate, 

 entire Capsule s^sile, linear, terete or 4-angled, often more or less twisted and 

 curved, 4-ceiled. Seeds linear-oblong, smooth. 



Con^la yellow, turning reddish or greenish 



Capsule fusiform. , o «„^j«„^ 



Capsule linear. 1- '^- (^ndtnum. 



Leaves narrowly linear. 



Plant glabrous, or nearly so. 



Pods straight, erect. 4. s. parmlum. 



Vi.^^^''^' often reflexed. 5. S. flexuosum. 

 Plant more or ess pubescent, at least when young. 



Plant strigiUose; leaves usually dentate. 6. S. strigulosum. 



I'lant hu-sutulous below, often glandular above: leaves usually entire, 



hnear. c c niihpns 

 Leaves oval, lanceolate, or oblong. puoens. 



Petals 1-2 mm long. 



Plant dwarf, only a few centimeters high, strigiUose ; capsule about 2 cm. 



^^^^- 9. S. minus. 



