104 PROCEEDINGS OP THE AMERICAN ACADEMY 



* * Leaves mostly opposite, entire. 



Weak and slender ; leaves long, linear ; flowers axillary, 

 androgynous ; bracts linear. Vancouver's Is. . . Q. A. zostercefolia. 



Erect ; leaves oblong, obtuse, distant ; bracts ovate- 

 rhombic. Alaska 7. A. Gmelini. 



Sect. II. Annuals : radicle superior (except in 8) : leaves mostly alternate. 

 § 3. Bracts ovate, sessile, entire and not foliaceous nor appendaged in fruit. 

 * Lower leaves opposite ; bracts free ; radicle inferior. 



Flowers axillary ; leaves small, crowded 8. J.. Californica, 



* * Leaves alternate ; bracts united. 

 Flowers axillary, solitary ; fruiting bracts y long 



leaves small, entire, crowded. Nevada 9. J., pusilla. 



Male flowers in short spikes ; pistillate solitary ; fruiting 

 bracts 1" long, pubescent ; leaves 1' long, thin, entire. 



Upper Missouri 10. .4. Endolepis. 



Male flowers in interrupted spikes ; pistillate very small, 



solitary ; leaves Z-&' long, ovate, subentire. Mexico. 11. A. monilifera. 

 Flowers axillary, clustered, staminate above; fruiting 

 bracts 3" long, subhastate, smooth ; leaves rounded, 

 dentate. Rocky Mountains 12. .4. Siichleyana. 



§ 4. Fruiting bracts small, oblong to cuneate-orbicular, united to above the 

 middle, 3-nerved, rarely appendaged, the truncate or rounded apex 

 narrowly margined and few-toothed ; leaves entire. 



Erect ; calyx 3-4-clef t ; fruiting bracts ovate-oblong, 

 truncate, obtusely 3-toothed leaves triangular- or " 

 cordate-ovate. Nevada . 13. ^. truncata. 



Low, ascending; calyx 5-cleft fruiting bracts ovate- 

 oblong, truncate, entire or suberose; leaves sub- 

 cordate-ovate. Colorado . 14. yl. saccaria. 



Low, slender; fruiting bracts ovate-oblong, truncatCj 



3-toothed, very small ; leaves linear, short. Colorado. 15. A. WoIJiL 



Ascending ; fruiting bracts sessile, broadly cuneate, sub- 

 muricate, the rounded summit sharply 3-5-toothed ; 

 leaves oblanceolate. Atlantic coast 16. .4. arenaria. 



Male spikes dense ; fruiting bracts very small, sessile, 

 suborbicular, with 3-5 small teeth above ; leaves 

 ovate to oblong, sessile. California 17. .4. microcarpa. 



Male spikes slender; fruiting bracts broadly cuneate, 

 pedicelled, the rounded summit sharply 5-toothed; 

 leaves oblanceolate to linear. New Mexico ... 18. A. Wrightii. 



§ 5. Fruiting bracts small, axillary, cuneate-orbicular, margined above the 

 united base and coarsely toothed, doubly tooth-crested or naked ; leaves 

 oblong to lanceolate, 1' long or less. 



Fruiting bracts broad, with equal triangular teeth, sides 

 doubly crested ; styles exserted ; leaves oblanceolate, 

 subentire. netioled 19. .4. Texana. 



