UMBELLIFEILE. (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 ; stylopodium 

 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 \CTTTOS, slender, and icav\6s, a stem.) 



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

 diffusely spreading, the very slender rays i-1' long and the longer pedicels 

 often 3-6" long; fruit tuberculate, " long. (Apium divaricatum, Benth. $ 

 Hook.) 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 sharp- 

 tuberculate or nearly smooth. (Apiastrum patens, Coult, fr Rose.) Central 

 Neb. to Tex. and N. Mex. 



29. DISCOPLEUBA, 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 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 

 8 AT/COS, a disk, and ir\vp6y t a rib.) 



1 . D. capillacea, 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 1 - l" long, ovate, 

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



2. D. Wuttallii, DC. Similar in habit ; in volucral bracts short and en- 

 tire ; fruit very small (%" long), as broad as high, blunt. 111. (]) to Ark., La,, 

 and Tex. 



30. C ONI TIM, 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 narrowly concave. Poisonous bien- 

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

 leaflets, involucre and involucels of narrow bracts, and white flowers. (Kwvciov, 

 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 places, 

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



31. CHJEROPHlfliLUM, 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 teriiately decom- 

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



