284 LXVII. UMBELLIFERZ. HYDROCOTYLE. 
Conspectus of the Genera. 
* Plants native or naturalized. 
RBakSheannadSda 
; Seeds flattish inside. Siwm. 8 
Fr. laterally compressed. ? Seeds grooved inside. Coniwm. 28 
§ Petals radiant. . Heracleum. 23 
Fr. dorsally compressed. ? Petals all equal. . Conioselinum. 18 
E | ee smooth ribs. . Ligusticum. 17 
of entire bracts. \ Fr. scarcely compressed, ? with bristly ribs. . Osmorhiza. 27 
| ; Rays2—4. . . Sanicula. 3 
s chad (Fr. very bristly. @Raysmany. . . Daucus. 25 
5 prone 2 Fruit not bristly... - «= Discopleurum. 5 
& (Involucre (of cleft bracts, ?one only, bipinnatifid. . PRR ch MN ey 29 
5 Cal. limb § Leaves 3-parted, .. . Cryptotenia. 9 
wel. =) obsolete. ? Leaves finely divided. . Ch@erophyliwm.26 
3 2 Fr. laterally compressed. ( Calyx limb 5-toothed. © . . Cicuta. 
as §the margin singly winged. . . Archemora. 
= rH Fr. dorsally compressed, ? the paseo doubly winged. . . Archangelica. 
2 J © Unvoluc. 0. | Fruit scarcely compressed, ovoid-globose. . : Ae ac . Athusa. 
Fs , ‘ f § Lvs. linear. . Crantzia. 
iS : ies 4—30 pedicellate or subsessile flowers. ¢ Lvs. roundish. Hydrocotyle. 
& \ Umbels simple, (densely capitate, with 50 or more sessile flowers. . . « Eryngium. 
Carpels with 5 wingedribs. . . .  . Thaspiwm. 
: Carpels with 5filiformribs. . . . . Zizia. 
Involucels minute. ( Carpels smooth, ribs obsolete. 6 $ . Polytenia. 
Involucels very large. Leaves simple, perfoliate. . . < - Bupleurum. 
Flowers yellow. ( Involucels 0. Fruit much compressed dorsally. : 2 5 . Pastinaca. 
* * Cultivated exotics, not naturalized. 
Fruit laterally ean - Apium. 13 
Petals all equal.{ compressed, ? oval. é - Carun. ll 
Involucre 0, or Fruit notcompressed. . . Pimpinella. 12 
of 1 entire bract. ( Petals radiant. . - 7 F - + « Coriandrum. 30 
. Petroselinwm. 14 
white. : Involucre of a few cleft bracts. 
‘ . Feniculum. 19 
Firion scliow, 3 sible Reuntaes eo etcaliets stat ee pie oc 
SuzorpeR1—ORTHOSPERM &. 
The inner surface of the seeds and albumen flat or nearly so. 
L HYDROCOTYLE 
Gr. 4dwp, water, xorv\n, 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 vittee—Herba- 
ceous, creeping, usually aquatic plants. Umbels simple. Involucre few- 
leaved. 
1. H. Americana. Pennywort. 
Smooth and shining; s¢. fwiform, procumbent; dvs. reniform-orbicular, 
slightly lobed, crenate; wméels sessile, 3—5-flowered; fr. orbicular.—2 A small, 
delicate plant, growing close to the moist earth beneath the shade of other vege- 
tables, Can. toS.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. Michz.) 
Smooth; lvs. peltate, orbicular, crenate; wmdbels capitate, proliferous, sub- 
sessile, about 5-flowered; fr. acute at base.—2| 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 subsessile, in close umbels which become whorls in inter- 
rupted spikes by other umbels being successively produced on the extending 
peduncle. Jn. ; 
3. H. umBetiata. Umbellate Pennywort. 
Smooth; Jus. peltate, orbicular, crenate, emarginate at base, on long peti- 
oles ; scapes about as long as the petioles; wmbels simple, often proliferous; i. 
pedicellate—2 In ponds and bogs, Mass. ! 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. 
