Order 63.— UMBELLI7ERJ3. zTl 



g Beak slender, longer than tho fruit Yittse none Scandix. 17 



g Beak short or none. — Fruit upwardly hispid Osmoriiiza. 18 



— Fruit glabrous.— Carpels 5-ribbed .Cn^BOi'HYLLUM. 19 



— Carpels 9-ribbed Trepocaepus. 38 



h Marginal wings twice longer than the dorsal Coxioselinum. 20 



h Marginal and dorsal wings alike. Leaflets large Ligusticum. 21 



i Fruit a double globe. Plant low, early flowering Eeigenia. 22 



i Fruit ovate, — with obscure, straight ribs. Tall Eulophus. 23 



— with distinct, crinckled ribs. Large Conium. 24 



j Fruit roundish-oblate (broader than long). "With involucels Ciccta. 25 



j Fruit roundish-oblong. Involucels none or almost none IIelosciadium. 26 



j Fruit elliptic-oblong. Leaves large, 3-foliate, serrate Cryptot^exia. 27 



j Fruit ovate, — smooth, strong-ribbed. Involucels drooping ^Etuusa. 23 



— clothed with scales. Involucels spreading Leptocaulis. 29 



k Calyx teeth obsolete. Leaves pinnate, with serrate lfts Sium. 32 



k Calyx teeth persistent. — Leaflets capillaceous. Yitta; 4 Disco-pleura. 30 



— Leaflets linear, entire. — Vittse 16. . Neueopxiyllum. 31 

 — Vittaj 6. . . .Cynosciadiuxi. 89 



J Flowers of 2 sorts, tho outer radiant. Fruit globous Coeiandeum. 33 



1 Flowers all alike. — Fruit terete (not compressed), ovate Pimpinella. 34 



— Fruit compressed laterally. — Vittse nono ^gopodium. 35 



— VitUc 8 to 12 j Apium. 85 



I Cacum. 3T 



t. HYDROCOT'YLE, L. Penny-wort. (Gr. vdtop, water, norvXr], a 

 Vessel ; the concave leaf often holds water.) Calyx obsolete ; petals 

 equai, ovate, spreading, entire, the point not inflected ; style shorter 

 than stamens ; fruit laterally flattened, the commissure narrow ; car- 

 pels 3-ribbed, without vittae. — Herbaceous, creeping, usually aquatic 

 plants. Umbels simple. Invol. few-leaved. 



* Leaves reniform or cordate, the base lobes not united Nos. 1 8 



* Leaves peltate, orbicular, the base lobes united Nos. 4, 5 



1 H. Americana L. Smooth and shining; st. filiform, procumbent; lvs. reniform- 

 orbicular, slightly lobed, crenate ; umbels sessile, 3 to 5-flowered ; fr. orbicular. — 

 U A small, delicate plant, growing close to the moist earth beneath tho shade 

 of other vegetables, Can. to S. Car. Sts. branching, 2 to 6' long. Lvs. thin, 1 

 to 2' diam., on petioles 2 to 3' long. Fls. greenish white, small, nearly sessile, 

 in simple, capitate, sessile, axillary umbels. Jn. — Aug. 



2 H. rammculoides L. /. Lvs. reniform-orbicular, deeply o-lobed, middle lobes 

 smallest, all crenate ; ped. much shorter than the petioles, branched ; umbel 5 to 

 9-flowered, capitate. — 1[ "Waters, Va. to Ga. and La. (Hale). Sts. rooting at the 

 joints, or floating. Petioles thick, 4 to 8' long, ped. 1 to 2'. Lvs. veiny. Sty. 

 spreading and incurved. JL, Aug. 



3 H. repanda Pers. Lvs. broad-ovate, cordate, very obtuse, margin repand- 

 denlate ; ped. simple, much shorter than the petiole3, umbels capitate, 3 or 4- 

 flowered. — 11 Muddy shores, S. Car. to Pla. and La. (Hale). St, creeping. Ped. 

 radical, slender, 2 to 3' high, the petioles 3 to 8'. Fr. large, broader than long. 

 Involucre 2 ovate bracts. Jn. — Aug. 



4 H. interrupta Huhl. Lvs. peltate, orbicular, crenate; umbels capitate, proli- 

 ferous, about 5-flowered; fr. acute at base. — If. In wet places, New Bedford, Mass. 

 to Ga. (Mettauer, Feay). Rt. and stem creeping. Lvs. almost centrally peltate, 

 thin, 8 to 13" diam. Petioles 2 to 6' long. Ped. longer than the petioles. Fls. 

 subsessile, in close umbels which become whorls in interrupted spikes by other 

 umbels being successively produced on the extending peduncle. Jn. 



5 H. umbellata L. Lvs. peltate, orbicular, crenate, emarginate at base, on long 

 petioles; scapes about as long as the petioles; umbels simple (rarely proliferous) 

 fls. 20 to 30, pedicellate. — U In ponds and bogs, Mass. to La., rare. Sts. creep- 

 ing, often submersed, several inches long. Lvs. 8 to 12" diam., notched at base 

 so as to appear reniform. Petioles a little eccentric, and with the scapes, slender, 

 floating or erect, and 4 to 6' long. May — Jl. 



