Allium Liliaceae 309 



This species is found infrequently in small or large colonies throughout 

 the state along roadsides and about abandoned habitations. When it is once 

 established, nothing can compete with it ; hence it forms pure stands. The 

 nativity of the species is not known but most authors give it as Eurasian. 



N. B. to Ont., southw. to N. C. and Tenn. ; escaped from cultivation. 



1049. ALLIUM L 



Blades of leaves elliptic, usually 3-10 cm wide, 15-20 cm long, not present at flowering 



time 1. A. tricoccum. 



Blades of leaves linear, terete or flat, present at flowering time. 

 Leaves terete. 



Umbels bulblet-bearing; spathe 1-valved, generally 10-30 mm long; flowers about 

 4 mm long; pedicels mostly 15-30 mm long; stamens slightly longer than the 

 perianth segments; filaments petal-like, the upper half divided into 3 linear 

 divisions, the middle division bearing an anther about 0.5 mm long; introduced 



species 2. A. vineale. 



Umbels not bulblet-bearing; stamens included; filaments linear, entire, bearing an 

 anther about 1 mm long. 

 Divisions of the perianth elliptic-lanceolate or oval-lanceolate, acute; pedicels 



mostly 8-10 mm long; plant of Eurasia. (Cultivated chive.) 



A. ScJwenoprasum. 



Divisions of the perianth linear-lanceolate, attenuate-acuminate; perianth mostly 

 8-15 mm long; pedicels about 5 mm long; plant indigenous at least north- 

 ward. (See excluded species no. 134, p. 1033.) 



A. Schoenoprasum var. sibiricum. 



Leaves flat or keeled. 

 Umbels bulblet-bearing. 



Spathe 1-valved, the beak more than 1 cm long, usually about 10 cm long; 



summit of the stem curved or coiled before flowering 3. A. sativum. 



Spathe more than 1-valved, the beak short, less than 1 cm long. 



Bulbs not multiplying; leaves flat, narrow, mostly 2-3 mm wide and keeled 

 beneath; beak of spathe mostly 3-5 mm long; flowers few, white or 

 pinkish, 4-6 mm long; filaments of all of the stamens entire; pedicels 



10-40, usually 15-20 mm long; native species 4. A. canadense. 



Bulbs producing bulblets; leaves flat, mostly 8-16 mm wide, the margins 

 scabrous; flowers purplish; filaments of alternate stamens toothed. (See 



excluded species no. 135, p. 1034.) A. Scorodoprasum. 



Umbels not bulblet-bearing. 



Umbels nodding, the 2 bracts persistent; scapes sharply keeled; stamens con- 

 spicuously exserted 5. A. c&rnuum. 



Umbels erect, the 2 bracts soon deciduous; scapes terete or nearly so; stamens 

 about as long as the perianth segments. (See excluded species no. 136, p. 

 1034.) A. stellatum. 



1. Allium tricoccum Ait. Wood Leek. Map 636. Infrequent to rare in 

 moist, rich soil throughout the state, although there are no records from 

 the southwestern counties. It seems to prefer slopes and woods near 

 streams and it is most often found associated with beech and sugar maple. 



N. B. to Minn, and Iowa, southw. to Ga. and Tenn. 



2. Allium vineale L. Crow Garlic. Map 637. My specimens are all 

 from southern Indiana where it is one of the most pernicious of all weeds. 

 A pioneer who lived in Point Township, Posey County, told me that when 

 he was a boy (about 1860) both the garlic and wild onion were common 



