EVENING PRIMROSE FAMILY 163 



3. CORDYLOPHORUM (Nutt.) Rydb. l. C. suffmticosum. 



4. ZAUSCHNERIA Presl. 



Leaves ovate; lateral veins strong. 1. Z. Garretlii. 



Leaves oblanceolate; lateral veins faint. 2. Z. crassifolia. 



5. GAYOPHYTUM A. Juss. Baby's Breath. 

 Seeds canescent. 



Petals 3-6 mm. long. 1. G. eriospermum. 



Petals about 1 mm. long. 



Plant diffusely branched, glabrous throughout, or upper part of the stem and 

 capsules strigiUose; capsule distinctly pedicelled. 2. G. lasiospermum- 



Plant with strict branches, hlrsutulous; pedicel of capsule very short or almost 

 none. 3. G. Helleri. 



Seeds glabrous. 



Capsules torulose, less than three times as long as the pedicels, usually more or less 

 clavate. 

 Petals 3-6 mm. long; capsules scarcely longer than the pedicels. 



4. G. diffusum. 

 Petals 1-3 mm. long. 



Plant pubescent with spreading hairs. 5. G. caesium. 



Plant glabrous throughout or the young capsules strigillose. 



Petals 1.5—2.5 mm. long, rose with yellow base; capsules 8-12 mm. long. 



nearly twice as long as the pedicels. 6. G. intermedium. 



Petals about 1 mm. long, rose or white. 



Capsules decidedly clavate, rounded at the apex, seldom longer than 

 the pedicels, spreading or reflexed. 7. G. ramosissim.um. 



Capsules only shghtly if at all clavate, narrow, usually longer than 

 the pedicels, and erect. 8. G. Nuttallii. 



Capsules neither torulose nor clavate; pedicel very short. 



Capsules narrow, scarcely flattened, with suberect seeds. 9. G. racemosum. 



Capsules broader, flattened contrary to the septiun, with oblique seeds. 



10. G. pumilum. 



6. ISNARDIA L. Marsh Purslane. i. I. palustn's. 



7. BOISDUVALLIA Spach. 



Capsule lOGuJicidal, a considerable portion of the septa remaining attached to the valves 

 at dehiscence; leaves mostly alike. 

 Leaves ovate or ovate-lanceolate, dentate, glabrous or nearly so. 1. B. glabella. 

 Leaves narrowly lanceolate, entire or remotely denticulate, softly pubescent. 



2. B. parviflora. 

 Capsule septicidal; septa adherent to the placenta, rendering the latter 4-winged; upper 

 floral leaves broader. 3. B. salicina. 



8. CLARKIA Pursh. Clarkia, Pink Fairies. l. C. pulchella. 



9. PHAEOSTOMA Spach. 1. P. rhomboidea. 



10. OENOTHERA L. Evening-primrose. 



Free tube of the hypanthlum 1.5-4 cm. long. 



Petals turning pmk or purplish in age, 3—4 cm. long. 



Free tips of the sepals about 4 mm. long; pubescence of the leaves short, that of 



the calyx not very copious. 1 . O. Hookeri. 



Free tips of the sepals 2-2.5 mm. long: pubescence of the leaves long and loose, 

 that of the calyx copious. 2. O. hirsutissima.- 



Petals not turning pink or purplish in age, less than 3 cm. long. 

 Free tips of the sepals 3 mm. long or longer. 



Spike not conspicuously leafy-bracted; bracts lance-linear, none except the 

 very lowest ones exceeding the hypanthlum-tube or the fruit m length. 



3. O. subuhfera. 

 Spike conspicuously leafy-bracted; bracts, even the upper ones, exceeding the 

 hypanthlum-tube or the fruit in length. 

 Bracts caudate-acuminate, with twisted tips; plant canescent; corolla 



about 15 mm. long. 4. O. Cockerellii. 



Bracts not caudate-acimainate. 



Petals 10-12 mm. long; plant green. 5. O. muricala. 



Petals 20-30 mm. long; plant canescent. 6. O. ornaia. 



Free tips of the sepals about 2 mm. long. 



Stem erect; petals 12-20 mm. long. 7. O. strigosa. 



Stem decumbent; petals about 10 mm. long. 8. O. depressa. 



Free tube of the hypanthlum 8-15 cm. long. 



Leaves linear, entire. 9. O. longissima. 



Leaves ovate or lanceolate, sinuate-dentate. 10. O. Jamesii. 



11. ANOGRA Spach. White Evening-Primrose. 



Calyx in bud merely acutish; tips not free or slightly so in no. 4. 

 Pubescence at least in part consisting of long silky hairs. 



