206 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



Leaves of the basal shoots narrowly lanceolate to linear, usually more than 3 times as 

 long as broad. 



Stem leaves narrowly linear ; inner sepals 1-nerved 3 . L . tenuif olia . 



Stem leaves oblong-linear; inner sepals 3-nerved 4. L. leggettil. 



1. Lechea minor L. 



Dry soil; between Chevy Chase and Glen Echo. May. Eastern U. S. 

 Erect, 30-60 cm. high, with mostly oval or oblong leaves. 



2. Lechea racemulosa Lam. 



Dry or rocky soil; common. Eastern U. S. 



Erect, 30-50 cm. high, with linear-oblong stem leaves. 



3. Lechea tenuifolia Michx. 



Dry sterile soil; infrequent; Addison Heights, Hyattsville. Eastern U, S. 

 A low diffuse plant, usually not more than 20 cm. high, with very narrow stem 

 leaves, these about 1 mm. wide and 1-1.5 cm. long. 



4. Lechea leggettil Britt. & Holl. 

 Dry soil; frequent. Eastern U. S. 



Plants 30-50 cm. high, the stem leaves 3-4 mm. wide and 1.5 cm. long. 



106. VIOLACEAE. Violet Family. 



Sepals not prolonged and auricled at the base; petals greenish; plants usually GO- 

 SO cm. high, the stout stems bearing numerous elliptic or oval, entire leaves. 



1. CUBELIUM. 



Sepals prolonged and auricled at the base; petals violet, white, or yellow; plants 

 usually less than 40 cm. high, the stems slender or none 2. VIOLA. 



1. CUBELIUM Raf. 



1. Cubelium concolor (Forst.) Raf. Green violet. 



Low rich woods along the Potomac; rare. Apr.-May. Eastern U. S. {lonidium 

 concolor Benth. & Hook.; Hybanthus concolor Spreng.; Solea concolor Ging.) 



2. VIOLA L.i Violet. 



Plants with slender, elongate, often branched, leafy stems at flowering time. 

 Stipules entire or nearly so, the lower ones scarious; petals yellow; capsules usually 



densely woolly 1. V. eriocarpa. 



Stipules deeply toothed or lobed, green; petals violet or white; ripe capsules 

 straw-colored. 

 Plants perennial, with rootstocks; stipules small, deeply toothed. 



Petals pale violet; leaves rounded at the apex 2. V. conspersa. 



Petals white or creamy white; upper leaves very acute 3. V. striata. 



Plants annual, with fibrous roots; stipules large and leaflike, coarsely lolled, the 



lobes not gland-tipped 4. V. rafinesquii. 



Plants stemless, the leaves and flower stalks rising directly from a rootstock, the plants 

 sometimes developing long slender runners. 

 Plants developing long slender runners after flowering; rootstocks long and very 

 slender; petals white, the lower lined with purple. 

 Leaves never heart-shaped, tapering or truncate at the base. 

 Leaves lanceolate, usually less than 2 cm. wide, several times as long as broad. 



long-tapering at the base 6. V. lanceolata. 



Leaves ovate, usually more than 2 cm., often 5 cm. wide, not more than twice 

 as long as broad, usually truncate at the base 6. V. primulifolia. 



* The author of the account of this genus is indebted to Dr. Ezra Brainerd for 

 generous assistance in the determination of the local violets, especially those of 

 supposed hybrid origin. 



