122 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



3. ERYTHRONIUM L. Trout lily. 



The plants of this genus are often called adder's-tongue, or dog-tooth violet. 



Flowers yellow; stigmas short, clublike 1. E. americanum . 



Flowers white; stigmas 2-3 mm. long, recurved 2. E. albidum. 



1. Erythronium americanum Ker. Trout lily. 

 Common in moist woodlands. Apr. Eastern U. S. 



Sometimes the flowers are deeply tinged with brownish red. The flowers are shown 

 in plate 17B. 



2. Erythronium albidum Nutt. White trout lily. 

 Locally common in moist woodlands along the Potomac above Little Falls. Apr. 



A plant of the Mississippi Valley, extending east in the Potomac Basin to Washington; 

 also in N. Y. and Ga. 



4. ORNITHOGALUM L. Star of Bethlehem. 



Flowers in corymbs, erect; pedicels long, slender 1. O. umbellatum. 



Flowers in racemes, drooping; pedicels short, stout 2. O. nutans. 



1. Ornithogalum umbellatum L. 



Locally common in fields and waste places. May. Northeastern U. S., south to Va. 

 Introduced from Eur. 



2. Ornithogalum nutans L. 



Rare in waste places. Apr. Eastern U. S. Escaped from gardens; native of Eur. 

 Both species are reported as weeds in Maryland. 



5. MUSCARI Mill. Grape hyacinth. 



Perianth oblong, urn-shaped, 4-6 mm. long; leaves narrow, 2-4 mm. wide, recurved. 



1. M. racemosum. 

 Perianth globose, 2-3 mm. long; leaves broader, 4-8 mm. wide, erect. 



2. M. botryoides. 



1. Muscari racemosum (L.) Mill. 



Frequent northwest of Washington in rich soil as a garden escape; well established 

 along the Potomac. Apr. Northeastern U. S. ; native of southern Eur. 



2. Muscari botryoides (L.) Mill. 



Two collections from Plummers Island. Naturalized from Eur. in the eastern U. S. 

 This species may be more plentiful around Washington, as M. racemosum has been 

 confused with it and few collections, made of either. 



6. HEMEROCALLIS L. 

 1. Hemerocallis fulva L. Orange day lily. 



Waste land, meadows, and along streams throughout our region. July. Eastern 

 U. S., as an escape from cultivation; native of Eur. and Asia. 



The clustered roots have peculiar fleshy swellings which serve as storage organs. 



Hemerocallis flava, the yellow day lily, is common in parks and gardens. 



7. ALETRIS L. Colic-root. 



Flowers 7-10 mm. long, white or yellowish white 1. A. farinosa. 



Flowers about 5 mm. long, bright yellow 2. A. aurea. 



1. Aletris farinosa L. 



Locally common in dry open pine scrub and on sterile hillsides mostly below the 

 fall line; also in bogs. June. Eastern U. S. 



The rosettes are evergreen and even persist on burnt-over land where the dead 

 cover was sparse. 



2. Aletris aurea Walt. 



Near Laurel, July 14, 1918 (McAtee). In sandy soil, Md. to Tex. 



