226 PROCEEDINGS OF THE AMERICAN ACADEMY 



1. ALLIUM, Linn. 



§ 1. Bulbs cespitose, narrowly oblong and crowning a more or less persistent 

 rhizome ; coats membranous, without peculiar reticulation : spathe mostly 

 2-valved : scape terete. 



# Leaves (2 or 3) elliptic-lanceolate : ovules solitary. 



1. A. tbicoccum, Ait. Bulb-coats fleshy-membranous, the outer 

 becoming fibrous : scape 4 to 1 2 inches high : flowers greenish white, 

 on short suberect pedicels ; segments two or three lines long, the outer 

 channelled, the inner flat: stamens short, hypogynous, with nearly 

 distinct subulate filaments : capsule deeply lobed, not crested. — A. 

 triflorum, Raf. New England to Wisconsin, and south to North 

 Carolina and Kentucky. 



* * Leaves (several) linear : ovules a single pair. 

 ■*- Leaves terete, hollow. 



2. A. Schcenoprasum, Linn. Scape stout : umbel subcapitals : 

 flowers rose-color ; segments 4 or 5 lines long, acuminate : stamens in- 

 cluded : capsule not crested. — A. campanuleeflorum, Geyer. From 

 Canada (New Brunswick) and the Great Lakes to the Columbia and 

 Peace Rivers and N. Alaska ; Europe and N. Asia. 



+- -»- Leaves flat or channelled. 



3. A. CEFvNUUM, Roth. Outer bulb-coats sometimes finely fibrous : 

 scapes slender, £ to 2 feet high : leaves 1 to 4 lines broad : umbel 

 open, nodding : flowers numerous, on very slender pedicels, rose- 

 colored or white ; segments 2 or 3 lines long, broad and acutish : 

 stamens and style exserted : capsule crested. — From the Alleghany 

 Mountains to British Columbia, Oregon, Utah, New Mexico and 

 Texas. 



4. A. validum, "Watson. Scape very stout, 1 to 2\ feet high, 

 from a stout rhizome : leaves 2 to 8 lines broad : umbel often slight ly 

 nodding, with 2 to 4 bracts, densely many-flowered ; pedicels short : 

 flowers rose-colored or nearly white ; segments 3 or 4 lines long, 

 narrowly acuminate : stamens and style usually slightly exserted : 

 capsule not crested, subglobose. — King's Rep. 5. 350. Oregon to N. 

 California and N. Nevada. 



5. A. brevistylum, Watson, 1. c. Scape 1 to 1\ feet high, from 

 a stout rhizome : leaves 2 to 4 lines wide : spathe 1-valved : umbel 

 erect, few-flowered ; pedicels 6 to 1 2 lines long : flowers deep rose- 

 color ; segments 4 or 5 lines long, narrow, long-acuminate, nearly 

 twice longer than the stamens and style: capsule not crested. — 

 Northwestern Wyoming to S. Utah. 



