286 LXVil. UMBELLIFERJE. CICUTA 



er. Heads numerous, less than 1 ' diam. Flowers pale blue or nearly white. 

 Jl. Aug. 



5. DISCOPLEURA. DC. 



Gr. 6ia<os, the disk ; rr\evpa, a rib; i. e. the disk and ribs (of the fruit) united. 



Calyx teeth subulate, persistent ; petals ovate, entire, with a mi 

 nute, inflexed point ; fruit ovate, often didymous ; carpels 5-ribbed, 

 the 3 dorsal ribs filiform, subacute, prominent, the 2 lateral united, 

 with a thick accessory margin ; intervals with single vittae, seeds sub- 

 terete. Lvs. much dissected. Umbels compound. Bracts of the in- 

 volucre cleft. Fls. white. 



D. CAPILLACEA. DC. (Ammi. Spreng.} Bishop-weed. 



Erect or procumbent; umbels 3 10-rayed; Ifts of the invol. 3 5, mostly 3- 

 cleft; //. ovate. In swamps near the coast, Mass. ! to Ga. Stem much 

 branched, 1 2f high. Leaves very smooth, ternately dissected, with subulate, 

 spreading segments. Umbels axillary, pedunculate, spreading. Involucre leaf- 

 lets about 3, with setaceous segments. Involucels filiform, longer than the um- 

 bellets. JL Nov. 



6. BUPLEURUM. Tourn. 



Gr. 0ovs, an^x, Tr\vpov, a rib; from the ribbed (veined) leaves of some of the species. 



Calyx margin obsolete ; petals somewhat orbicular, entire, with a 

 broad, closely inflexed point ; fruit laterally compressed ; carpels 5- 

 ribbed, lateral ones marginal ; seed teretely convex ; flattish on the 

 face. Herbaceous or shrubby. Lvs. mostly simple. Invol. various. 

 Fls. yellow. 



B. ROTUNDIFOLIUM. Modtsty. Thorough-wax. 



Lvs. roundish-ovate, entire, perfoliate ; invol. ; involucels of 5, ovate, 

 mucronate bracts ; Jr. with very slender ribs, intervals smooth, mostly without 

 vittae. In cultivate'd grounds and fields, N. Y. and Penn. and la. ! rare. Stem 

 If or more high, branching. Leaves 13' long, f as wide, rounded at base, 

 acute at apex, very smooth. Umbels 5 9-rayed. Involucels longer than the 

 umbellets. Fruit crowned with the wax-like shining base of the styles (stylo- 

 podium). Jl. Aug. 



7. CICUTA. 



A Latin name used by Virgil (Ec. 2d and 5th) but of unknown application. 



Calyx margin of 5, broad segments ; petals obcordate, the points 

 inflected ; fruit subglobose, didymous ; carpels with 5 flattish, equal 

 ribs, 2 of them marginal ; intervals filled with single vittse, com- 

 missure with 2 vittae ; carpophore 2-parted ; seeds terete. ^ Aquatic 

 poisonous herbs. Leaves compound. Stems hollow. Umbels perfect. 

 Invol. few-leaved or 0. Involucels ma?iy-leaved. Fls. white. 



1. C. MACULATA. Water Hemlock. Spotted Cowbane. 



St. streaked with purple ; lower Ivs. triternate and quinate ; upper biter- 

 nate ; segments lanceolate, mucronately serrate; umbels terminal and axillary. 

 Common in wet meadows, U. S. and Can. Stem 3 6f high, smooth, striate, 

 jointed, hollow, glaucous, branched above. Petioles dilated at base into long 

 abrupt, clasping stipules. Leaflets or segments 1 3' -long, | f wide, finely 

 serrate, the veins mostly running to the notches, rarely to the points ! Umbels 

 rather numerous, naked, 2 4' broad. Involucels of 5 6 short, narrow, acute 

 bracts. Fruit 1" diam., 10-ribbed, crowned with the permanent calyx and 

 styles. Jl. Aug. The thick, fleshy root is a dangerous poison, but sometimes 

 used in medicine. 



2. C. BULBIFERA. Bulbiferoiis Cicuta. Narrow-leaved Hemlock. 



Axils of the branches, bulbiferous ; Ivs. biternately divided ; Ifts, linear, with 

 remote, divergent teeth ; umbels terminal and axillary.. In wet meadows, Penn. 



