62. SaxI FRAG ACE AE 143 



59. Platanaceae Lindl. — Plane-tree Family 



1. Platanus L. — Sycamore 



P. occidentalis L. In woods and along streams, common through- 

 out 111. May. 



60. Crassulaceae DC. — Stonecrop Family 



1 . Sedum L. — Stonecrop 

 ] . Leaves thick, terete or nearly .so. 



2. Petals yellow; leaves obovoid, densely imbricated, about ?> mm 

 long; follicles 3-4 mm long; plants perennial; rocky places 

 and roadsides; occasionally escaped from cult.; native of Eur. 

 June-Aug. Mossy Stonecrop S. acre L. 



2. Petals rose-purple, pink, or white; leaves linear, crowded, 5-25 



mm long, about 2 mm wide; follicles 4-6 mm long; on rocks, 



s. 111. May-July S. pulclwllum Michx. 



1. Leaves flat, broad. 



3. Petals white; leaves roundish-obovate, entire, chiefly in whorls 



of 3 or the upper alternate; rocky woods, and in moist soil in 



wooded ravines, local. May. Wild Stonecrop 



S. ternatum Michx. 



3. Petals pink or purple; leaves oval or obovate, dentate or entire, 

 alternate, 2-5 cm long. 



4. Petals pink, 3-4 times the length of the sepals; follicles attenu- 

 ate to the slender style; cliffs, not common; s. 111. Aug.- 

 Sept. American Orpine S. tclephioides Michx. 



4. Petals purple, about twice the length of the sepals; follicles 

 abruptly pointed with the short style; sometimes escaping 

 to roadsides and waste places; native of Eurasia. Aug.- 

 Sept. Live-forever. [S. purpureum Link; S. tdephiiun 

 sensu auth., non L.] S. triphyllum (Haw.) S.F.Gray 



61. Penthoraceae Van Tieghem — Penthorum Family 



1 . Penthorum L. — Ditch Stonecrop 

 P. sedoides L. Wet ground, common throughout 111. July-Sept. 



62. Saxifragaceae DC. — Saxifrage Family 

 1. Ovary 1-loculed; placentae parietal or nearly basal. 



2. Petals entire; inflorescence paniculate; leaves all basal 1. Heuchera 



2. Petals fringed; inflorescence racemose; stem with a pair of opposite, 



sessile leaves 2. Mitella 



1. Ovary 2-loculed ; placentae axial. 



3. Stamens 5; seeds wing-margined 3. Sullivantia 



3. Stamens 10; seeds wingless 4. Saxifrage 



