UMBELLIFERAB 103 



Obs. The plant which I have taken for this, is becoming so rare, 

 and my specimens are so defective, that I may be mistaken in it. 

 The T. atropurpureum, Nutt. may probably yet be found along the 

 Schuylkill, within this County ; but it has not, thus far, been de- 

 tected. 



f 1 1 Carpels laterally compressed, or contracted ; ribs not winged. 



157. ZIZ'IA, Koth. 



[Dedicated to J. B. Zizii; a German Botanist, collaborator of Koch.] 

 Fruit oval; carpels contracted at the junction so as to appear didy- 

 mous ; ribs 5, nearly equal ; channels with 1 to 3 vittae. Mostly 

 smooth, yellowish-green perennials, with yellow flowers, and a gen- 

 eral resemblance to Thaspium. 



1. Z. C'Orcliitcl, Koch. Radical leaves undivided, cordate, cre- 

 nate-dentate ; stem-leaves ternately dissected; segments ovate, ser- 

 rate ; ribs of the carpels conspicuous ; vittae single. 



CORDATE ZIZIA. Heart-leaved Alexanders. 



Stem 1 to 2 feet high, somewhat branched above, sometimes pubescent. Radical 

 leaves 1 or 2 to 4 inches long, and nearly as wide as long, somewhat glaucous be- 

 neath ; petioles 3 to 9 inches in length. Stem-leaves 3-parted, on short petioles, the 

 upper ones sessile. Umbels terminal and axillary, on peduncles 2 to 6 inches long. 

 II Jib. Open woods, and borders of thickets : frequent. Fl. May. Fr. July. 



2. Z. integ&rrima, DC. Leaves all bi-tri-ternately dissected; 

 leaflets ovate-oblong, very entire ; ribs of the carpels inconspicuous ; 

 vittae 3 in each channel. 



VERY ENTIRE ZIZIA. 



Whole plant glabrous. Stem \% to 2 feet high, slightly branching above, and 

 sometimes from the base, purplish when young. Leaflets 1 to near 2 inches long ; 

 common petioles dilated, ribbed, and purplish. Umbels mostly terminal, on pedun- 

 cles 3 to 6 inches long; rays very slender, 1 to 3 inches long, spreading, some of 

 them often divaricate. 

 Hab. Rocky hills : not common. Fl. May. Fr. July* 



158. BUPLJEtPRUM, Tournefi 



[Gr. Bous, an Ox, and Pleuron, a rib, or side ; but the application is obscure.] 



Fruit ovate-oblong; carpels somewhat didymous in appearance, 5- 

 ribbed; channels with or without vittae. Annuals, or perennials: 

 leaves simple, mostly entire; flowers greenish-yellow; involucre 

 sometimes none ; involucels various. 



1. B. rotundifdlium, L. Leaves roundish-ovate, very entire, perfoli- 

 ftte ; involucre none 5 involucels of 5 ovate mucronate leaflets, longer 

 than the umbellets; vittae none. 



liOUND-LEAVED BUPLEURUM. ThorOUgh-WOX. 



Annual ; smooth; stem 1 to 2 feet high, branching. Leaves 1 to 3 inches long, 

 rather acute, rounded at base, glaucous beneath. Umbels terminal, 5- to 9-rayed. 

 Fruit crowned with the disk-like base of the styles, which has a shining waxy ap- 

 ]x?arance ; ribs filiform. 

 Hob. Gardens, and waste places. Nat. of Europe. Fl. June. Fr. Aug. 



159. CICITTA, L. 



[The ancient Latin name of the Hemlock.] 

 Fruit subglobose ; carpels with 5 flattish equal ribs ; channels with 



