DICOTYLEDONOUS PLANTS 



159 



1. E. yuccaefolium, Michx. Button Snakeroot, Rattlesnake 

 Master. Perennial. Stem erect, branched above, striate, covered 

 with a bloom, 2-3 ft. high. Leaves linear, often 2 ft. or more in 

 length, rigid, covered with a bloom, parallel- veined, fringed with white 

 bristles. Bracts shorter than the heads, entire, bracteoles similar 

 but smaller. Flowers white. Fruit scaly. In damp soil.* 



II. SANICULA, Tourn. 



Slender, erect, perennial herbs. Rootstock short, stoiit, 

 creeping. Leaves palmately cut. Umbels small, somewhat 

 globular, irregularly compound ; bracts leafy ; bracteoles few ; 



Fig. 19. — Flower and Fruit of Umbelliferse. 



A, flower of Foeniculum ; B, fruit of Heracleum ; C, fruit of Heracleum, cross-sec- 

 tion ; o (in A), ovary ; d, disk ; sg, stigma ; s, stamens ; o (in jB, and C), oil-tubes ; 

 r, ribs. A, B, and C all enlarged. 



flowers perfect or staminate, greenish or yellowish. Calyx- 

 teeth as long as the small petals, sharp-pointed. Fruit ovoid, 

 covered with hooked prickles, ribless, each carpel with 5 oil- 

 tubes. 



1. S. marylandica, L. Sanicle, Black Snakeroot. Stem rather 

 stout, lj-4 ft. high. Leaves 3-7-parted, the divisions irregularly 

 serrate or dentate and often cut. Petals greenish-white, very small. 

 Fruit with two slender, recurved styles at the apex. Rich woods. 



III. ERIGENIA, Nutt. 



A little smooth plant with a slender, unbranched stem, from 

 a deep, nearly globular tuber. Leaves 1 or 2, twice or thrice 

 compound in threes. Flowers few, small, in an imperfect 

 leafy-bracted umbel. Calyx-teeth wanting. Petals obovate 



