284 LXVll. UMBELLIFERiE. Hydrocotyle. 



Cons-pcctus of the Genera. 

 * Plants native or naturalized. 



t Seeds flattish inside. Sium. 8 



fFr. laterally compressed. I Seeds grooved inside. Conium. 28 



J Petals radiant. . Heraclev/m. 23 



< Fr. dorsalli' compressed. ( Petals all equal. . Conioselinum. 18 



I <» with smooth ribs. . Ligivsticum. 17 



'of entire bracts. iFr. scarcelycompressed, ? with bristly ribs. . Osmorhiza. 27 



ns \ Rays 2—4. . . Sanicula. 3 



S S < Fr. very bristly. ( Rays many. . . Daucus. 25 



o 5 several. ^ Fruit not bristly Discopleurum. 5 



§• r Involucre Lof cleft bracts, (one only, bipinnatifid Erigenia. 29 



§ ] ( Cal. limb I Leaves 3-parted, . . Ci yptotcenia. 9 



. " ^ obsolete. \ Leaves finely divided. . Chccrovhyllum.'Ha 



.■§ 2i \ ("Fr. laterally compressed. ( Caly.x hmb 5-toothed. , . Cicuta. 7 



-g f ^ I J Uhe margin singly winged. . . Archemora. 21 



* g I Fr. dorsally compressed, J the margin doubly winged. . . Archangelica. 20 



£ I t) Linvoluc.O. L Fruit scarcely compressed, ovoid-globose JEthv^a. 16 



fc ) 5 Lvs. linear. . Crantzia. 2 



o ^ with 4—30 pedicellate or subsessile flowers. ( Lvs. roundish. Hydrocotyle. 1 



5 L Umbels simple, (densely capitate, with 50 or more sessile flowers. . . . Eryngium. 4 



I Carpels with 5 winged ribs Thaspiwn. 15 



< Carpels with 5 filiform ribs Z/zia. 10 



C Involucels minute. ( Carpels smooth, ribs obsolete. . . . Polyteenia. 24 



< Involucels very large. Leaves simple, perfoliate. . . . . Bupteurum. 6 



Flowers yellow. ( Involucels 0. Fruit much compressed dorsally Pastinaca. 22 



* * Cultivated exotics, not naturalized. 



( Fruit laterally (, roundish. . Apium. 13 



( Petals all equal. < compressed, i oval. , . Carum. 11 



( Involucre 0, or < ( Fruit not compressed. . . Pimpinella. 12 



, < of 1 entire bract. ( Petals radiant Coriandrum. 30 



^M'hite. ( Involucre of a few cleft bracts Petroselinum. \i 



Flowers (yellow Foe,niculum. 19 



Suborder 1.— O RTHOSPERMJE. 



The inner surface of the seeds and albumen flat or nearly so. 

 1. HYDROCOTlTLE. 



Gr. v6o)p, water, kotvXti, a vessel ; the concave leaf often holds water. 



Calyx obsolete ; petals equal, ovate, spreading, entire, the point 

 not inflected ; styles shorter than stamens ; fruit laterally flattened, 

 the commissure narrow; carpels 3-ribbed, without vittae. — Herba- 

 ceous, creepi?ig, usually aquatic plants. Umbels simple. Involucre few- 

 leaved. 



1. H. Americana. Penny 7t:arf. 



Smooth and shining; st. fjiJiform, procumbent; lvs. reniform-orbicular, 

 slightly lobed, crenate; umbels sessile, 3 — 5-flowered; fr. orbicular. — % A small, 

 delicate plant, growing close to the moist earth beneath the shade of other vege- 

 tables, Can. to S. Car. Stems branching, 2 — 6' long. Leaves thin, 1—2' diam., 

 on petioles 2 — 3' long. Flowers greenish- white, small, nearly sessile, in sim- 

 ple, capitate, sessile, axillary umbels. Jn.— Aug. 



2. H. INTERRUPTA. Muhl. (H. vulgaris, Michx.) 



Smooth ; lvs. peltate, orbicular, crenate ; uvibcls capitate, proliferous, sub- 

 sessile, about 5-flowered ; fr. acute at base. — %. In wet places. New Bedford, 

 Mass. T. A. Greene, rare. Root and stem creeping. Leaves almost centrally 

 peltate, thin, 8—10" diam. Petioles 2—3' long. Peduncles longer than the 

 petioles. Flowers subses.sile, in close umbels which become whorls in inter- 

 rupted spikes by other umbels being successively produced on the extending 

 peduncle. Jn. 



3. H. UMBELLATA. Umbellate Pennywort. 



Smooth ; lvs. peltate, orbicular, crenate, emarginate at base, on long peti- 

 oles ; scapes about as long as the petioles; uvibcls sinvple, often proliferous; /5. 

 pedicellate. — % In ponds and bogs, Ma.ss. ! to La., rare. Stems creeping, often 

 submersed, .several inches long. Leaves 8—12" diam., notched at base so as to 

 appear reniform. Petioles a little eccentric, and with the scapes slender, float- 

 ing or erect, and 4—6' long. Umbels 20— 30-flowered, the upper pedicel often 

 prolonged and umbellate. May — Jl. 



