Genus 41. 



CARROT FAMILY. 



653 



Ammoselinum Butleri (Engelm.) Coult. & Rose, of wet grounds from Arkansas to Texas, and 

 recorded from Missouri, differs in being nearly smooth, with fruit only i" long. 



41. ERIGENIA Nutt. Gen. i : 187. 1818. 



A low glabrous nearly acaulescent perennial herb, arising from a deep tuber, with ter- 

 nately decompound leaves, usually a single-leaved involucre, and small umbels of white 

 flowers. Calyx-teeth obsolete. Petals flat, obovate or spatulate, entire. Fruit nearly 

 orbicular, broader than long, notched at both ends, glabrous. Carpels incurved at top and 

 bottom, with S slender ribs and 1-3 small oil-tubes in the intervals. [Greek, spring-born.] 



A monotypic genus of central North America. 



I. Erigenia bulbosa (Michx.) Nutt. Har- 

 binger of Spring. Fig. 3165. 



Sison bulbosuin Michx. Fl. Bor. Am. i : 169. 1803. 

 Erigenia bulbosa Nutt. Gen. i : 188. 1818. 



Stem scapose, s'-g' high, bearing a leaf invo- 

 lucrate to the umbel. Basal leaves 2-4, petioled, 

 ternately divided into thin oblong obtuse seg- 

 ments, the involucral one similar, smaller, short- 

 petioled ; petioles much dilated and sheathing at 

 the base; umbels mostly compound, of 1-4 slender 

 rays ; involucels spatulate or sometimes folia- 

 ceous ; pedicels very short in flower, i"-2i" long 

 in fruit; fruit about l" long and li" broad. 



Ontario to the District of Columbia and Alabama; 

 west to Minnesota and Kansas. Feb.-April. Turkey- 

 pea. Pepper-and-salt. 



42. CONIUM L. Sp. PI. 243. 1753. 



Tall biennial glabrous poisonous herbs, with 

 spotted stems, pinnately decompound leaves, and 

 small white flowers in compound many-rayed 

 umbels. Involucre and involucels of ovate- 

 acuminate bracts. Calyx-teeth obsolete; petals obcordate, or entire with a short inflexed 

 point; fruit broadly ovate, glabrous, somewhat flattened laterally. Carpels strongly wavy- 

 ribbed ; oil-tubes none, but a layer of oil-secreting tissue next the deeply concave seed. 

 [Greek, hemlock.] 



One, or perhaps two species, the following typical one native of Europe and Asia, the other 

 of South Africa. 



I. Conium maculatum L. Poison Hem- 

 lock or Snakeweed. Fig. 3166. 



Conium maculatum L. Sp. PI. 243. 1753. 



Erect, much-branched, 2°-S° high. Lower and 

 basal leaves petioled, the upper sessile or nearly 

 so, all pinnately dissected, the leaflets ovate in 

 outline, thin, the ultimate segments dentate, or 

 incised; petioles dilated and sheathing at the 

 base; umbels l'-3' broad, the rays slender, I'-ii' 

 long; pedicels filiform, 2"-s" long in fruit; flow- 

 ers about i" broad; fruit li" long, about i" wide, 

 its ribs very prominent when dry. 



In waste places. Nova Scotia to Ontario, Delaware, 

 Indiana and Michigan. Also in California and Mex- 

 ico, Santo Domingo and South America. Natural- 

 ized from Europe. St. Bennet's-herb. Cashes. 

 Wode-whistle. Poison or spotted parsley. Bunk. 

 June-July. 



43. AEGOPODIUM L. Sp. PI. 265. 1753. 



Perennial herbs, with 1-2-ternate leaves, and compound umbels of white flowers. Bracts 

 of the involucre and involucels none, or rarely few and early deciduous. Calyx-teeth obso- 

 lete. Petals inflexed at the apex. Stylopodium thick, conic. Fruit ovate-oblong, glabrous, 

 somewhat compressed. Carpels obscurely S-angled, the ribs slender, equal, distant; oil-tubes 

 none. Seed-face flat. [Greek, goat-foot.] 



One or perhaps two species, natives of temperate Europe and Asia, the following typical. 



