FLORA OF THE DISTRICT OF COLUMBIA. 171 



1. Drosera rotundifolia L. 



Boijs near Kenilworth, Suitland, Ilyatlsvillo, and BoUsville. .Tuly-Aug. Widoly 

 distributed in N. Amor.; also in Eur. and Asia. .' ' ■ 



2. Drosera intermedia TIayne. 



Bogs near Forest Glon and Beltsville. July-Aug. Eastern X. Amer.; also in Eur. 

 In botli species the leaves are covered with long red gland-tipped hairs which 

 entrap insects. 



70. PODOSTEMACEAE. 



1. PODOSTEMUM Michx. 



1. Podostemum ceratopliyllum Michx. Riffleweed. 



On rocks in streams; infrequent. Summer. Eastern U. S. 



71. CRASSULACEAE. Orpine Family. 



1. SEDUM L. StoisECROP. 



Flowers in one-sided racemes; petals white; leaves entire 1. S. ternatura. 



Flowers not in one-sided racemes; petals pink or purple; leaves toothed. 



Petals purple, twice as long as the sepals 2. S. triphyllum. 



Petals pink, 3-4 times as long as the sepals 3. S. telephioides. 



1. Sedum ternatum Michx. Three-leaved stonecrop. 

 Rocky woods; common. May. Northern states, south to Ga. 



2. Sedum triphyllum (Ilaw.) S. F. Gray. Live-for-ever. 

 Occasional along roadsides. Native of Asia; common in gardens. 



3. Sedum telephioides Michx. Wild live-for-ever. 

 Oil rocks along the Potomac. Aug. N. Y. to Ga. 



72. PENTHOSACEAE. Ditch stonecrop Family. 



1. PENTHORUM L 

 1. Peuthorum sedoides L. Ditch stonecrop. 



Ditches and wet places; infrequent. July-Aug. Eastern U. S. 



73. SAXIFRAGACEAE. Saxifrage Family. 



Petals none. Calyx lohes usually 4 and stamens 8; low marsh plant. 



1. CHRYSOSPLENIUM. 

 Petals 5. 



Stamens 5. Leaves mostly basal, long-petioled, orbicular 2. HEIJCHERA. 



Stamens 10. 



Stem leaves 2, opposite 3. MITELLA. 



Stem leaves none, the foliage leaves all from base of plant. 



Flowers in racemes; ovary 1-celled 4'. TIARELLA . 



Flowers in cymes; ovary 2-celled 5. SAXIFRAGA. 



1. CHRYSOSPLENIUM L. 



1. Chrysosplenium americanum Schwein. Water-carpet. 



Springy placps; infrr>quont . Apr. -May. Northern states, south to Ga. 



2. HEUCHERA L. 

 1. Heiicliera americana L. Alum-root. 



Rocky woods; frequent. May. N. Y. to N. C. 



