ONAGEACE^. (EVENING-PKIMROSK FAMILY.) lO". 



3. GAYOPHYTUM, A. Juss. 



Calyx-lobes reflexed. Petals white or rose-colored. — Xery slender hranth 

 ing annuals, witli linear entire leaves, and very small axillary Howers. 



1. G. ramosissimum, Torr. & Gray. Glabrous, or the inflorescence 

 puberulent, dijj'uselj much branched : flowers ^ line long, mostli/ near the ends 

 of the branches: capsule ublony, 2 or 3 lines lomj, on jn-direls of about the same 

 length or shorter, often deflexed, 3 to 5-seeded. — Fl. i. 513. Colorado and 

 northward, and westward to Oregon and California. 



2. G. racemosum, Torr. & Gray. Glabrous, or more or less canescent 

 with short apinx'ssed ])ubescence, the elongated branches mostly simple: flowers 

 ^ line long, axillarj/ the whole length of the branches: capsules linear, sessile 

 or verji shortli/ pedicelled, 8 to 10 lines long, usuailg mam/sreded. — Fl. i. 

 514. Colorado and northward, thence westward to Washington and Cali- 

 foriiia. 



4. CENOTHERA, L. Evexing PhiMRosfc. 



Calyx-lobes reflexed. Petals obcordate or obovate. Stamens 8. Capsule 

 coriaceous or somewhat Avoody to membranaceous. — Herbs, or sometimes 

 woody at base : flowers axillary, spicate, or racemose. — Watson, Proc. Am. 

 Acad. viii. 573. 



§1. Stigma lobes linear, elongated: cal>/x-tid)e linear, sl/ghtl// dilatrd at thr 

 throat: anthers linear. 



* Caulescent: Jiowers in a leafij spike, erect in the bud, yellow: capsules sessile, 



coriaceous : seeds in two roics. 



■«- Capsules oblong, slightly attenuate above: seeds with more or less margined 



angles, nearly smooth. 



1. CE. biennis, L. Erect, rather stout, 1 to 5 feet liigh, usually simple: 

 calyx-tuhe 1 to 2^ inches long: capsule f to 1 inch long. — Common every- 

 where and very variable. 



Var. grandiflora, Lindl. Petals equalling the calyx-tube. — Same 

 range, but less common eastward. 



■t- H- Capsules linear: seeds not margined, minutely tuherculate. 



2. CE. rhombipetala, Nutt. Spike elongated, dense : calyx silky- 

 canescent : petals rhombic-ovate. — Torr. & Gray, Fl. i. 493. Probably 

 within the eastern limits of our range, and thence to the Indian Territory 

 and northward to Minnesota. 



* * Caulescent : JloLcers noddinq in the bud, rrhitc turning to rose-rolor : rnpsulr:; 



sessile, mostly linear : seeds in a single row. 



3. CE. pinnatifida, Nutt. Annual or biennial : cahix-tips not frrr, 

 throat naked : seeds oral, not angled, finely pitted. — Along the eastern slope 

 of the Rocky Mountains from the Dakotas to the Indian Territory and New 

 Mexico 



4. CE. trichocalyx, Nutt. Annual : calyx very villous : the tips not free, 

 throat naked : sp((ls bnirr-h'nrar, smooth. — Tovr. & Gray, Fl. i. 404. (E. del- 

 toidea, Torr. From W. Wyoming to California, and thence to Arizona and 

 New Mexico. 



