ONAGRACEAE (EVENING PRIMROSE FAMILY) 343 



turning green or reddish in age. Stamens 8; anthers versatile, oblong. Style 

 filiform; stigma capitate. Capsule 4-celled, usually linear, 4-angled, often 

 contorted, sessile, dehiscent loculicidally. Seeds in 1 row in each cell. 



Flowers yellow, sometimes turning red or green. 



Capsules straight . . . . . . . . . . 1. S. andinum. 



Capsules more or less curved or contorted. 



Capsules merely curved, less than 2 cm. long 2. S. Nelsonii. 



Capsules contorted, 2-3 cm. long . . . . . . . 3. S. contortum. 



Flowers white or rose-color. 



Foliage glabrous . . .4. S. tortum. 



Foliage tomentose 5. S. utahense. 



1. Sphaerostigma andinum (Nutt.) Walp. Repert. 2: 70. 1843. Only 

 3-7 cm. high, becoming diffusely branched, canescently puberulent through- 

 out: leaves linear-spatulate, 1-2 cm. long, attenuate into slender petioles: 

 spikes mostly dense, many-flowered, erect; flowers 2 mm. long, yellow: cap- 

 sules 6-12 mm. long, attenuate upward from near the base: seeds linear- 

 oblong, 1 mm. long, nearly smooth. From Western Wyoming to Washing- 

 ton and California. 



2. Sphaerostigma Nelsonii Heller, Muhl. 1: 1. 1900. Stems simple or 

 two or more from the base, erect, 3-10 cm. high, minutely puberulent or at 

 length glabrous: leaves linear to oblong or broader, entire, 12-25 mm. 

 long, mostly short-petioled : flowers yellowish, minute, axillary, mostly 

 crowded near the end of the stems: calyx-tube very short, about as long as 

 the narrowly ovate, obtusish segments: petals oval with acutish ends, scarcely 

 exceeding the sepals and equaled by the pistil and the longer stamens, about 

 1.5 mm. long: capsule nearly straight, spreading or erect, linear, striate at 

 maturity, obscurely puberulent. Shale cliffs, Green River, Wyoming. 



3. Sphaerostigma contortum flexuosum A. Nels. Bot. Gaz. 40: 58. 1905. 

 Small, about 1 dm. high; branches few, divaricate, ascending, usually a pair 

 near the base: leaves linear: flowers yellow; calyx-tube obconic: capsule cy- 

 lindrical, sessile, linear, 2-3 cm. long, variously curved, usually deflexed and 

 again upturned, producing S-shaped forms: seeds smooth. [S. pubens (Wats.) 

 Rydb. as to Fl. Colo.; not S. contortum pubens (Wats.) Small.] Western 

 Colorado and Wyoming and Utah. 



4. Sphaerostigma tortum (Levl.) A. Nels. 1. c. 60. Branched from the base 

 and spreading, becoming at length nearly prostrate: leaves glabrous, mostly 

 basal, oblanceolate and tapering into slender petioles: capsules about 2 -cm. 

 long, cinereous, variously contorted. [S. minutiflora (Wats.) Rydb. Bull. 

 Torr. Bot. Club 33: 146. 1906.] Western Wyoming, through Utah and 

 Wyoming to Idaho. 



4a. Sphaerostigma tortum Eastwoodae A. Nels. 1. c. 61. Leafy through- 

 out, the leaves oblong-linear: flowers very small: capsule tapering into a slen- 

 der beak, spirally coiled at base. Glenwood, Colorado. 



5. Sphaerostigma utahense Small, Bull. Torr. Bot. Club 23: 191. 1896. 

 Whitened with a tomentose pubescence, branching from the base upward, 

 15 cm. or more high: leaves ovate, obovate, or oblanceolate, 2-4 cm. long, 

 generally tapering to a short petiole: flowers crowded in terminal somewhat 

 corymbose racemes, white: calyx-tube longer than the lanceolate lobes: petals 

 obovate, 5 mm. long, longer than the stamens but surpassed by the pistil: cap- 

 sule linear, less than 2 cm. long, more or less contorted. Utah and probably 

 in western Colorado. 



14. CHYLISMA Nutt. 



Caulescent annuals with pinnate or simple leaves and yellow flowers in ter- 

 minal racemes. Calyx-tube funnelform or obconic, the limb 4-parted. Petals 

 4, entire. Stamens 8, unequal; anthers oblong, attached near the middle. 

 Stigma capitate, entire. Capsule linear, subcylindrical or subclavate, obtuse, 

 membranaceous, not sessile. Oenothera in part. 



1. Chylisma scapoidea (Nutt.) Small, Bull. Torr. Bot. Club 23: 193. 



