35 2 CRASSULACEAE 



PODOSTEMACEAE 

 i. Podostemon Michx.* 

 I. P. ceratophyllum Michx. In shallow streams: Mass. to N. Y., 

 Ont., Minn., Ga., Ala. and Ky. 

 Conn. Rare or occasional. 



N. Y. Near Newburgh, not recently collected. 

 N. J. Mercer, Passaic, and Warren counties. 

 Pa. Pike, Monroe, Northampton, Chester and Delaware counties. 



CRASSULACEAE 



Stamens as many as the calyx lobes. I. Tillaeastrum. 

 Stamens twice as many as the calyx lobes. 



Petals 6-20. 2. Sempervivum. 

 Petals 5 or fewer. 



Carpels spreading; flowers perfect. 3. Sedum. 



Carpels erect; flowers polygamous. 4. Rhodiola. 



i . Tillaeastrum Britton * 

 1. T. aquaticum (L.) Britton (Tillaea aquatica L.). Muddy 

 banks of streams: N. S. to Md., La. and Tex., Wash, to 

 Iowa, Calif, and Colo., Europe to N. Africa. 

 Rare and local, apparently more common near Philadelphia, and 

 coastal Conn, than elsewhere, not reported from near N. Y. 



2. Sempervivum [Rupp.j L. 

 1. S. tectorum L. Escaped from cultivation: Mass. to N. J. 

 Native of continental Europe. 

 A very rare escape in our range; commonly cultivated. 



3. Sedum [Tourn.] L. 



Flowers not corymbose. 



Leaves densely imbricated, short. I. 5. acre. 



Leaves oblong or lanceolate, more or less flattened, not im- 

 bricate. 2. 5. lernatum. 

 Flowers corymbose, petals purple, twice as long as the sepals. 3. S. triphyllum. 



i. S. acre L. On rocks and along roadsides: N. B. to Ont. and 

 N. Y. and Pa. Adventive from Europe. 



Occasional in most parts of our range except in the pine-barrens, 

 there rare or wanting. 



* Sec footnote, page 76. 



