STANDLEY—ALLIONIACEAE OF THE UNITED STATES. 337 
Stems stouter, much branched; leaves con- 
spicuously ciliate-.-__-_-.--._----------- 14. A. ciliata, 
Stems puberulent throughout, low, much 
branched. 
Leaves ovate to elliptical, obtuse; bracts 
obtuse____-__---------------------~----- 15. A. pumila. 
Leaves lanceolate, acute; bracts acute____- 16. A. brandegei. 
Inflorescence not axillary. 
All leaves except the uppermost conspicuously 
petioled, 
Plants 1 to 2 meters tall; flowers very large; 
stems pubescent throughout; leaves cor- 
date, pubescent. 
One flower in each involucre; stems and 
leaves viscid; branches of the inflorescence 
opposite; petioles, even those of the upper 
leaves, long ~~~--_---------------------- 1. 4A. viscosa, 
Two or 8 flowers in each involucre; stems 
and leaves puberulent but not viscid; 
branches of the inflorescence alternate; 
petioles shorter, the uppermost leaves al- 
most sessile. ~~ ee 20. AL rotata, 
Plants considerably lower and with much 
smaller flowers. 
Lenves thick, fleshy, and rather rigid; stems 
pubescent = throughout: inflorescence 
bracteate. 
Stems soft - pubescent or puberulent 
throughout; leaves with long petioles. 17. A. pachyphylla. 
Stems hirsute; petioles shorter; leaves 
larger ~-.-----___--___---_ +--+ ++ 18, A. polytricha, 
Leaves thin and soft; inflorescence seldom 
bracteate (so in a few species only). 
Stems pubescent throughout. 
Stems subhirsute below; plant rather 
slender; leaves lanceolate or lance- 
ovate, rounded or cuneate at the base_ 2°. A. greggti. 
Stems not subhirsute below, but puberu- 
lent or finely pubescent. 
Leaves glabrous; plant tall and 
stout; leaves broadly ovate or ob- 
long, truncate or rounded at the 
base _.__------ 24. A. gigantea, 
Leaves pubescent. 
Leaves ovate, cordate or rounded 
at the base______________-__--_- 23. A. comata, 
Leaves lanceolate, cuneate or 
rounded ut the base ___ ~~ ~~ 21. A. coahuilensis, 
Stems not soft-pubescent or puberulent 
throughout, mostly glabrous below. 
Fruit) glabrous: leaves cordate-ovate 
inflorescence bracteate____--------~-. 31, A, terensis. 
