UMBELLIFEK^.. (PARSLEY FAMILY.) 209 



28. LEPTOCAULIS, Nutt. 



Calyx-teeth obsolete. Fruit very small, ovate, usually bristly or tuberculate, 

 with somewhat prominent ribs , oil-tubes solitary in the intervals ; stylopodiuni 

 conical; seed-face plane or somewhat concave. — Very slender smooth branch 

 ing annuals, with finely dissected leaves (segments filiform or linear), and 

 small white flowers in very unequally few-rayed pedunculate umbels (Name 

 from AeTTTJs, slender, and KavKbs, a stem.) 



1. L. divaricatus, DC. Plant 1-2° high, with branches and umbels 

 diffusely spreading, the very slender rays i-V long and the longer pedicels 

 often 3-6" long; fruit tuberculate, ^" long. (Apium divaricatum, Betif/t. ^- 

 Hook.) — X. C. to Fla., west to Ark. and Tex. ; reported from Kan. April. 



2. L. patens, Nutt. Of similar habit, but the umbels shorter and more 

 strict, the rays 3-6" long or less and the pedicels short; fruit densely sharp- 

 tuberculate or nearly smooth. (Apiastrum patens, Coult. tf- Rose.) — Central 

 Neb. to Tex. and N. Mex. 



29. DISCOPLEURA, DC. Mock Bishop-weed. 



Calyx-teeth small or obsolete. Fruit ovate, glabrous ; carpel with dorsal 

 ribs filiform to broad and obtuse, the lateral very thick and corky, those of 

 the two carpels closely contiguous and forming a dilated obtuse or acute corkv 

 band ; oil-tubes solitary , stylopodium conical , seed nearly terete. — Smooth 

 branching annuals, with finely dissected leaves, involucre of foliaceous bracts, 

 involucels of prominent or minute bractlets, and white flowers. (Name from 

 8{(TKos, a disk, and nKevpSv, a rib.) 



1 . D. capill^cea, DC. Plant 1 - 2° high (or even 5 - 6°) ; leaves dissected 

 into filiform divisions; umbel 5-20-rayed; involucre of filiform bracts usually 

 cleft or parted, and involucels more or less prominent ; fruit I - 1^" long, ovate, 

 acute. — Wet ground, Mass. to Fla.. west to 111., Mo., and Tex. June - Oct. 



2. D. Nuttallii, DC. Similar in habit; involucral bracts short and en 

 tire; fruit very small (^" long), as broad as high, blunt. — 111. (') to Ark., La., 

 and Tex. 



30. CONIUM, L. Poison Hemlock 



Calyx-teeth obsolete. Fruit ovate, somewhat flattened at the sides, gla- 

 brous, with prominent wavy ribs ; oil-tubes none, but a layer of secreting cells 

 next tlie seed, whose face is deeply and narrowly concave. — Poisonous bien- 

 nial, with spotted stems, large decompound leaves with lanceolate pinuatifid 

 leaflets, involucre and involucels of narrow bracts, and white flowers. (Kui/eiou. 

 the Greek name of the Hemlock, by which criminals and philosophers were 

 put to death at Athens.) 



C. -AiACU LATUM, L. A large branching European herb, in waste places, 

 N. Eng. to Penn,, and west to Iowa and Minn 



31. CH^ROPHYLLUM, L 



Calyx-teeth obsolete. Fruit narrowly oblong to linear, notched at base, with 

 short beak or none, and equal ribs; oil-tubes solitary in the intervals; seed-face 

 more or less deeply grooved. — Moist ground annuals, with ternately decom 

 pound leaves, pinnatifid leaflets with oblong obtuse lobes, mostly no involucre, 



