144 American Midland Naturalist Monograph No. 2 



1. POLANISIA Raf. 

 1. Petals whitish, 4-5 mm. long; stamens 9-12; sandy soil, often along railroads. 



July-Aug. Clammyweed P. graveolens Raf. 



1. Petals pale yellow, 8-10 mm. long; stamens 12-16; sandy soil, not common; 



probably has spread eastw. into 111. along railroads. June-Aug 



P. trachysperma T. SC G. 



2. Cleome L. 



C. seniilata Pursh. Dry soil, w. 111.; Henderson Co., Patterson: adv. from 

 w. U.S. July-Sept. [C. integrifolia T. 8C G.} 



3. Cristatella Nutt. 

 C. jamesii T. & G. Sandy soil. Mason and Jo Daviess counties. June-Aug. 



73. Sarraceniaceae LaPyl. — Pitcher-plant Family 



1. Sarracenia L. — Pitcher-plant 

 .5". purpurea L. Peat bogs. Lake and McHenry counties. May-June. [5'. 

 purpurea subsp. gibbosa (Raf.) Wherry} 



74. Droseraceae S. F. Gray — Sundew Family 



1. Drosera L. — Sundew 



1. Leaf-blades suborbicular; seeds fusiform, striate, glossy, 1-1.5 mm. long; 

 bogs, n. 111. July-Sept. Round-leaved Sundew D. rotundifolia L. 



1 . Leaf-blades linear-spatulate; seeds ellipsoid, papillose, 0.7-1 mm. long; bogs 



rare, n.e. III. July-Sept. [D. longifolia of auth.} Long-leaved Sundew 



D. intermedia Hayne 



75. Crassulaceae DC. — Stonecrop Family 



1. Petals 5, acute; plants succulent; pistils 5 or 4, distinct or nearly so, becoming 

 follicles in fruit I . Sedum 



1. Petals none or linear and inconspicuous; plants scarcely succulent; pistils becoming 

 united, and forming a 5-loculed capsule 2. Peulhonim 



1. Sedum L. — Stonecrop 

 1. Leaves thick, terete or nearly so. 



2. Petals yellow; leaves obovoid, densely imbricated, about 3 mm. long; fol- 

 licles 3-4 mm. long; plants perennial; rocky places and ro.ndsides, occa- 

 sionally 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, .>. III. May-July .... 

 S. pulchclluui 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 S. tematum Mich.v. 



