ORDER 63. UMBELLIFER.E. 377 



g Beak slender, longer than the fruit. Tittae none ............................ SCANDIX. 17 



g Beak short or none. Fruit upwardly hispid ............................. OSMORHIZA. IS 



Fruit glabrous. Carpels 5-ribbed .............. CILEROPIIYLLUM. 19 



Carpels 9-ribbed ................ TREPOCARPUS. 83 



h. Marginal wings twice longer than the dorsal ...................... COXIOSELINUJI. 20 



k Marginal and dorsal wings alike. Leaflets large ..................... LIGUSTICUM. 21 



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



i Fruit ovate, with obscure, straight ribs. Tall .................. EULOPIIUB. 3 



with distinct, crinckled ribs. Largo ................. COXIUM. 24 



j Fruit roundish-oblate (broader than long). "With involuccls .............. CICUTA. 25 



j Fruit roundish-oblong. Involucels none or almost none ........... HELOSCIADI UM. 20 



j Fruit elliptic-oblong. Leaves large, 3-foliate, serrate .............. CRVPTOT^NIA. 2T 



j Fruit ovate, smooth, strong-ribbed. Involucels drooping ............... JErnusA. 23 



clothed with scales. Involucels spreading ............ LEPTOCAULIS. 29 



k Calyx teeth obsolete. Leaves pinnate, with serrate Ifts ............... SIUM. 82 



k Calyx teeth persistent. Leaflets capillaceous. Tittaa 4 ....... DISCOPLEURA. CO 



Leaflets linear, entire. Vittae IG^NEUROPHYLLUM. Gl 

 Vittae G ---- CYNOSCIADICM. 39 



1 Flowers of 2 sorts, the outer radiant. Fruit globous ................ CORIANDRUM. S3 



I Flowers all alike. Fruit terete (not compressed), ovate .............. PIMPINELLA. 34 



Fruit compressed laterally. Vittae none .......... jEGOPODiuM. 35 



Vittae 8 to 12 ............ j APIUM. 86 



{ CARUM. ST 



T. HYDROCOT'YLE, L. PENNY-WORT. (Gr. vdwp, water, KorvA?/, a 

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

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

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

 pels 5-ribbed, without vittte. Herbaceous, creeping, usually aquatic 

 plants. Umbels simple. Invol. few-leaved. 



* Leaves reniform or cordate, the base lobes not united .......................... Nos. 1 3 



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



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

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

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

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

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

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



2 H. rantmculoides L. /. Lvs. reniform-orbicular, deeply 3-lobed, middle lobes 

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

 9-flowered, capitate. 14 Waters, Va. to Ga. and La. (Hale). Sts. rooting at tho 

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

 spreading and incurved. JI, Aug. 



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

 dentate ; ped. simple, much shorter than the petioles, umbels capitate, 3 or 4- 

 flowered. 14 Muddy shores, S. Car. to Ma. 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 Muhl. Lvs. peltate, orbicular, crenate: umbels capitate, proli- 

 ferous, about 5-flowered] fr. acute at base. 14 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 tho extending peduncle. Jn. 



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

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

 fis. 20 to 30, pedicellate. If 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. 



