Order 68.— THE UMBELWORTS. 213 



B. bulbo'sa. A small, early-flowering herb, "Western N. Y. to Mo. Stem arises 

 from a roundish tuber deep in the ground. The root leaf is thrioe ternate. The 

 invoUiorate leaf twice ternate. The dark-brown stamens with the little white 

 petals suggest its common name. 



6. OIOU'TA. Water Hemlock. 



Calyx 5-tootlied. Petals with the point inflected. Fnrit roundish, a 

 little contracted on the sides so as to appear somewhat double. Seeds 

 with 5, flattishj equal ribs, 2 of them on the margin. — y Poisonous herbs 

 with compound leaves and perfect umbels of white flowers. Invotucre 

 few-leaved or 1. Involucels many-leaved. 



1 O. macnla'ta. Spotted Water-Hemloch. Stem streaked with purple, 3-6f. high, 



smooth, striate, hollow. Lower leaves triternate and tripinnate, segments lan- 

 ceolate, serrate. Umbels 2-4' broad. Fruit 10-ribbed. Involuoels of 5 or 6 

 short, slender, acute bracts. Common in wet meadows. July, Aug. 



2 O. bulbi'fera. Narrow-lemed Water-Hemlock. Stem green, striate, slender, with 



little bulblets in the axils of the branches, leaves bi-ternately divided. Leaf- 

 lets linear or lance-linear, 2-4' long, with distant teeth. In wet meadows and 

 swamps. Aug. 



1. THAS'PIUM. Alexanders. 



Calyx minntely 5-toothed. Fruit elliptical, roundish across, not flat- 

 tened either way, seeds each with 5 winged ribs. — if Leaves divided. 

 Involucre none, involuoels few-leaved. The species resemble the Zieias 

 except in their fruit. May, June. (Figs. 483-6.) 



1 Eoot leaves simple, cordate, stem leaves once-ternately divided. . . .2 



1 T. barbino'de. Leaves bi- or tri-ternate, Ifts. cnt-serrate. St. hairy at joints. 



2 T. an'reum. Golden A. Fruit oval. Flowers yellow. Stem 2-3f. high. 



2 T. atropurpu'renm. Purple A. Fruit roundish. Flowers dark purple. Stem 2-8f. 

 high. S. M. 



8. ZIZaA. Alexanders. 



Calyx minutely 6-toothed. Fruit oval or ovate, flattened at the sides 

 so as to appear somewhat double. Seeds each with 5 ribs which are not 

 winged, but thread-like. — y Smooth, with divided leaves ajid yellow 

 flowers. Umbels compound, with no involucre or involucels. 



Z. integer'rima. Sntwe-lemed A. Eoot and stem leaves bi- and tri-ternate, leiiflets 

 entire. Plant l-2f. high, in rocky woods. May-July. 



