FLORA OF THE DISTRICT OF COLUMBIA. 181 



1. Cassia marilandica L. 



Thickets, woody, or low ground ; frequent. July-Aug. Eastern U. S. 



2. Cassia medsgeri Shafer. 



.Two 8pecimen3 from our region seen, neither with definite locality. Eastern U.S. 



4. CHAMAECRISTA Moench. 



Flowers 5-8 mm. wide; pedicels shorter than the sepals, stout 1. C. nictitans. 



Flowers 25-40 mm. -mde; pedicels mostly longer than the .sepals, very slender. 



2. C. fasciculata. 



1. Chamaecrista nictitans (L.) Moench. Sensitive pea. 

 Dry woods and fields; common. July-Oct. Eastern U. S. (Cassia nictitans h.) 

 In both our species the leaves are "sensitive," folding together when touched. 



2. Chamaecrista fasciculata (Michx.) Greene. Partridge pea. 

 Dry soil; common. July-Oct. Eastern IT. S. (Cassia c^omo^msta of many Ameri- 

 can authors, probably not of Linnaeus.) 



83. FABACEAE. Pea Family. 



Leaves all or mostly with 4 or more leaflets. 



Plants trees, armed with spines 10. ROBINIA. 



Plants wholly herbaceous, not spiny. 

 Leaflets digitate, all attached at the end of the petiole. Perennial with large blue 



flowers 3. LUPINUS. 



• Leaflets pinnately arranged , part or all of them attached along the rachis. 



Leaves evenly pinnate, without a leaflet at the end of the rachis, the rachis 

 usually ending in a tendril; flowers blue or purple. 

 Style with a tuft of hairs at the top; leaflets small, rarely 8 mm. wide, or 

 in one species large and toothed, thin and not very prominently veined. 



15. VICIA. 

 Style hairy on the inner side; leaflets large, mostly over 1 cm. wide, thick, 



entire, prominently veined 16. LATHYRUS. 



Leaves odd-pinnate, with a leaflet at the end of the rachis. 

 Leaflets 5 or 7 (sometimes 3 in the uppermost leaves); stems twining. Plants 

 perennial, with tuber-bearing roots; flowers brownish purple; leaflets 



10 mm. wide or larger ". 18. GLYCINE. 



Leaflets more than 7 in all or most of the leaves, usually much more numer- 

 ous; stems erect. . 

 Stems with short, closely appressed hairs; pods not flattened; flowers 



greenish yellow 11. ASTRAGALUS. 



Stems with long spreading hairs; pods flat; flowers yellowish and purple. 



9. CRACCA. 



Leaves with 1 or 3 leaflets. 



Leaves all with 1 leaflet, or simple. Flowers yellow. 

 Plants perennial, tall, somewhat shrubby, nearly glabrous; pods flat. 



Flowers 12 mm. long, nearly sessile 4. GENISTA. 



Flowers 25 mm. long, the pedicels 6-10 mm. long 5. CYTISXJS. 



Plants annual, low, herbaceous, very hairy; pods inflated 2. CROTALARIA. 



Leaves, at least most of them, with 3 leaflets. 

 Leaflets finely toothed (teeth almost obsolete in the common red clover, Trifolium 

 pratense). Flowers usually less than 1 cm. long; pods 1-few-seeded. 

 Flowers in long slender racemes, white or yellow. Plants sweet-scented; 

 pods small, not curved or coiled ..'..7. MELILOTUS. 



