UMBELLIFEK.*:. ( PARSLEY FAMILY.) 209 



28. LEPTOCAiJLIS, Nutt. 



Calyx-tcctli ()l)S()lcte. Fruit vt-ry small, ov ate, usually l>ristly or tuberculate, 

 with somewhat prominent ribs , oil-tubes solitary in tlic intervals ; stvloixxlium 

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

 in<^ annnals, with finely dissected leaves (segments filiform or linear), and 

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

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



1. L. divaric^tus, DC. Plant 1-2° high, with branches and umbels 

 diffusely spreading, the very slender rays 1-1' long and the longer ])edicels 

 often 3-6" long; fruit tuberculate, |" long. (Apium divaricatum, Benth. <lj' 

 lluuk.) — N. 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 sharj)- 

 tuberculato or nearly smooth, (Apiastrum i)atens, Coalt. c^- Rose.) — Central 

 Neb. to Tex. and N. Mex. 



29. DISCOPLEURA, DC. Mock Bisiior-wEia). 



Calyx-teeth small or obsolete. Fruit ovate, glabrous ; car])el 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 corky 

 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 

 ZlcTKos, n disk, and ir\^vp6v, a rib.) 



1 . D. capillacea, DC. riant l - 2° high (or even .5 - 6°) ; leaves di.ssected 

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

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

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



2. D. Nutt^Uii, 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 the seed, whose face is deeply and narnnvly concave. — Poisonous liien- 

 nial, with spotted stems, large (lecompound leaves with lanceolate i)innatifid 

 leaflets, involucre and involucels of narrow bracts, and white flowers. {Kwvf lov, 

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

 put to death at Athens.) 



C. MACULATUM, L. A large branching European herb, in waste jdaces, 

 N. Eug. to Penu., and west to Iowa and Minn 



31. CH^ROPHYLLUM, L 



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

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

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

 pound leaves, pinnatifid leaflets with oblong obtuse lobes, mostly uo involucre, 



14 



