CJMBELLIFERAE (^ARSLEY FAMILY) 613 



* * Bays of the umbel without involucels. 



3. 0. obtiisa (Coult. & Rose) Fernald. Stems glabrous or sparingly pubes. 

 cent, 1.5-7 dm. high; leaves 2-3-teniate, more or less crisp-pubescent -leaflets 

 1.6-6 cm. long, acuminate, the teeth mucronate ; umbels naked or obsolete! v 

 involucrate, with 8-5 naked finally very divergent rays; fruit on diverqcnt lonrj 

 pedicels, the enlarged portion 8-12 mm. long, rounded or short-beaked at tip- 

 stylopodium depressed, broader than high, with the style 0.3-0.5 mm lonq 

 {Washingtonia Coult. & Rose.) — Rich chiefly coniferous woods, Nfd and 

 s. Lab. to the upper St. John Valley, N. B.; and from Assina. and B. C. to 

 N. Mex. and Ariz. 



4. 0. divaricata Nutt. Similar, usually taller (4-10 dm. hitrh); umbels with 

 3-7 ascending-spreading rays; fruit on ascending pedicels, 11-17 mm. long, with 

 a conical beak 2 mm. long ; stylopodium conical, with the style about 1 mm! long 

 {Washingtonia Britton.) — Rich chiefly coniferous woods, Ga^^p^ Co. Que to 

 the White Mts., N. H.; also B. C. to Cal., Nev., etc. ' ^ •' 



8. SPERM6lEPIS Raf. 



Involucre none but involucels present. Flowers small in pedunculate com- 

 pound irregular umbels. Stylopodium small, conical. Fruit thin-walled ; oil- 

 tubes present. — Slender smooth branching plants. ('Name from air^p/xa, seed, 

 and Xe7r/s, scale, alluding to the scurfy or bristly fruit ; Leptocaulis Nutt. 



1. S. patens (Nutt.) Robinson. Stem geniculate, 3-5 dm. high ; leaf-seg- 

 ments linear-filiform ; fruit merely warty; oil-tubes many. (Leptocaulis Nutt.; 

 Apiastrum Coult. & Rose.) —Sandy soil and barrens, n. e. Ind, to Neb., and 

 southwestw. 



2. S. echinata (Nutt.) Heller. Similar in habit ; fruit bristly ; oil-tubes 6. 

 {Leptocaulis Nutt.) — Scott Co., Mo. {Eggert), and southvsr. 



9. CONIUM L. Poison Hemlock 



Fruit somewhat flattened at the sides, glabrous, with promi- 

 nent wavy ribs ; oil-tubes none, but a layer of secreting cells 

 next the seed, the face of which is deeply and narrowly con- 

 cave. — Poisonous biennial, with spotted stems, large decom- 

 pound leaves with lanceolate pinnatifid leaflets, involucre and 

 involucels of narrow bracts, and white flowers. {Kibveiov, the 

 Greek name of the Hemlock, by which criminals and philoso- 

 phers were put to death at Athens.) 



1. C. maculAtum L, a large branching herb, in waste 

 822. c. maculatuiB places. Que. to Del., Pa., and westw. (Nat. from Eu.) Fig. 

 x4. 822. 



10. PTILIMNIUM Raf. Mock Bishop's-weed 



Fruit ovate, glabrous ; carpel with dorsal ribs filiform to broad and obtuse, 

 the lateral very thick and corky, those of the two carpels closely contiguoiLs and 

 forming a dilated obtuse or acute corky band; oil-tubes solitary; stylopodium 

 conical; seed nearly terete. — Smooth annuals, with involucre of 

 foliaceous bracts, involucels of prominent or minute bractlets, and 

 white flowers. (Name unexplained by Rafinesque, presumably from 

 tttCKov, a feather, or down, in allusion to the finely divided leaves.) 



DiSCOPLEURA DC. 



1. P. capillaceum (Michx.) Raf. Plant 3-6(-18) dm. high; 

 leaf-divisions filiform ; umbel 5-20-rayed ; involucre of filiform 

 bracts usually cleft or parted, and involucels more or less prominent ; 

 fruit 2-6 mm. long, acute. (DiscoplruraDC.) — Brackish (rarely 

 fresh) marshes, along the coast, Mass. to Fla. and Tex. j locally n. in 828. P. cap\ 

 Miss, basin to Mo. and Kan. June-Oct. Fig. 823. kceum x 4 



