FLORA OF THE DISTRICT OF COLUMBIA. 171 



1. Drosera rotundifolia L. 



Bogs near Kenilworth, Suitland.nyattsville^nd Boltsville. Ji|ly-Aug. Widely 

 distributed in N. Amer,; also in Eur. and Asia. 



2. Drosera intermedia llaync. . 

 Bo CS near Forest Glen and Beltsville. July-Aug. Eastern N. Amer.; also m Eur 

 In "both species I ho leaves are covered with long red gland-tipped hairs which 



■entrap insects. 



70. PODOSTEMACEAE. 



1. PODOSTEMTJM Michx. 



1. Podostemum ceratophyllum Michx. Riffleweed. 



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



71. CRASSUIACEAE. Orpine Family. 

 1. SEDUM L. Stonecuoi'. 



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



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 stonecroi*. 

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



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

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



3. Sedum telephioides Michx. Wan i^ve-for-ever. 

 On rocks along the Potomac. Aug, N. Y. to Ga. 



72. PENTHORACEAE. Ditch stonecrop Family. 



1. PENTHORUM L 

 1. Penthorum sedoides L. r Ditch stonecrop. 



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



73. SAXIFRAGACEAE. Saxifrage Family. 



Petals none Calvx lobes usually 4 and stamens 8; low marsh plant. 



1. CHRYSOSPIENIUM. 



Petals 5. 

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



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 *• TIARELLA . 



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



1. CHRYSOSPLENIUM L. 



1. Chrysosplenium americanum Schwein. Water-carpet. 



^priney place: infrequeni. Apr-May. Northern states, south to Ga. 



3. HEUCHERA L. 

 1. Heuchera americana L. Alum-root. 



Rocky vo-kIs; frequent. May. N. Y. to N. G. 



