146 DICOTYLEDONOUS PLAiNTS. 



14. THASPIUM. Nutt. 



Calyx with the margin 5-toothed. Petals elliptic, attenu- 

 ated into a long inflexed point. Fruit not contracted at the 

 side, subelliptic. Carpels convex, with 5 winged ribs ; wings 

 subequal ; intervals grooved. General involucre none ; par- 

 tial one about 3-leaved. Differs from Cnidiian in its 5-tooth- 

 ed calyx, petals not emarginate, involucels 3-leaved and 

 in its habit. Pentandria, Digynia. 



* Umbels opposite. Flowers dark purple. 



1. T. atropurpureum Nutt. : stem smooth, dichotomously branched ; 

 radical leaves subcordate, simple, serrate ; cauline ones ternate ; leafets 

 ovate, acute, subcordate. Cnidium atropurpureum Spreng. Torr. 



HAB. Moist grounds. N. S. June. 2^. Stem 23 feet high. 

 Petals dark purple. Fruit small, with membranaceous wings. 



** Umbels terminal. Flowers yellow. 



2. 7'. aciatfotium Nutt. : stem very tall, smooth and straight ; lower 

 leaves tri- ternate ; upper ones bi-ternate ; leafets oval, coarsely tooth- 

 ed ; umbels numerous, terminal, somewhat whorled ; partial involucre 

 setaceous. Ligusticum actatfolium Mich. Torr. 



HAB. Can. to Car. July. U.Stem 34 feet high. Fruit ob- 

 long-oval, with the ribs somewhat winged. 



3. T. barbinode Nutt. : petioles and nodes of the stem pubescent ; 

 lower leaves tri-ternate ; upper ones bi-ternate ; segments cuneate- 

 ovate, acute, unequally and incisely serrate, entire at the base ; partial 

 involucre 3-leaved, setaceous. Ligusticum barbinode Mich. Smyrnium 

 barbinode Muhl. Ttiapsia tr\foliata Spreng. Torr. 



HAB. Banks of the Schuylkill, near Philadelphia. Nutt. Stem 

 2 3 feet high. Floiccrs yellow, in a terminal umbel. 



15. LIGUSTICUM. Linn. 



Calyx with the margin 5-toothed or obsolete. Petals obo- 

 vate, acute, emarginate, inflexed ; claw very short. Fruit 

 roundish in the transverse section, or slightly laterally com- 

 pressed. Carpels with 5 equal and somewhat winged ribs ; 

 the lateral ones margined. Involucre various partial one 

 many-leaved. Flowers white. Pentandria. Digynia. 



L. scoticum Linn. : stem erect, smooth and striate; lower leaves bi- 

 ternate ; upper ones ternate and nearly sessile ; leafets broadly ovate, 

 coarsely serrate ; umbels many-rayed ; flowers equal ; petals inflexed ; 

 involucres linear-lanceolate, 5 7-leaved. 



HAB. Borders of salt marshes. Salem, Mass. Big. Aug. If. 

 Stem 12 18 inches high. Flotcers white. Identical with the 

 foreign plant. Sea Lorajfe. t 



