608 UMBELLIFERiE. L e p t o c a u l is .
foot high (0. 4-5 feet, Ell.). Stem often much branched. Leaves ternately
dissected, with numerous spreading segments. Involucral leaves sometimes
2-3-pinnatifld. Rays of the umbel seldom more than 8, an inch or
more long. Umbellets shorter than the involucel. Fruit ovate, rather acute,
about a line and a half in length.—We have not seen the Ammi costatum of
Elliott.
2. D. Nuttallii (D C .): erect; umbels about 20-rayed; leaflets of the
involucre mostly entire ; fruit orbicular.—DC. 1. c. t. 9, Sr prodr. 4. p. 107.
Wet prairies, Kentucky (Short !) to Louisiana! and Tampa Bay, East
Florida! west to Texas !—Plant 2-6 feet high, branching above. Divisions
of the leaves somewhat verticillate. Involucre commonly less than half the
length of the rays ; the leaflets sometimes 3-cleft. Fruit smaller than in the
preceding species, rather broader than long.
9. LEPTOCAULIS. Nutt.in DC.mem. TJmb.p. 3 9,1.10, Sfprodr, 4.p. 107.
Margin of the calyx obsolete. Petals elliptical, entire. Fruit crowned
with the styles, laterally compressed, ovate. Carpels with 5 slightly prominent
ribs; the lateral ribs marginal. Intervals with single vittas. Commissure
with 2 vitt®. Carpophore slightly 2-cleft at the summit. Seed convex
on the back, flat on the face.—Erect very slender (North American) glabrous
herbs, with terete stems. Leaves many-cleft; the segments linear. Umbels
pedunculate, opposite the leaves and terminal, with few rays. Involucre
none. Rays of the umbellets few and Unequal, with a short fewleaved
involucel. Flowers small, white.
* Fruit neither scabrous nor echinate.
1. L. inermis (Nutt.) : fruit unarmed, somewhat rugulose.—Nutt. ! in
DC. mem. 1. c. t. 1 0 ,/. 2, S( prodr. 4. p. 107.
Prairies of Arkansas, Nuttall!—Stem about a span high. Involucre
wanting: involucels of 4-6 leaflets, as long as the partial rays. Rays of
the umbel unequal, the longest scarcely half an inch in length, with 1 or 2
short-pedicellate flowers in the centre. Rays of the Umbellets 2-3 lines
long. Fruit rather smaller than a mustard seed, slightly ribbed, with minute
intermediate rug*.
* * Fruit muricate or echinate.
2. L. diffusus (Nutt.): fruit muricated with very short somewhat appress-
ed scales; umbels and umbellets 3-4-rayed ; pedicels filiform, two-thirds as
long as the rays of the umbel.—Nutt. ! in DC. prodr. 4. p. 107.
Prairies of Arkansas, Nuttall! Texas, Drummond!—Plant 8-15 inches high,
very slender and divaricately branched. Rays of the umbel an inch or more
in length. Fruit roughened with minute tubercles, which terminate in short
scales or bristles.
3. L. divaricatus (D C .): fruit muricated with very short somewhat ap-
pressed scales; umbels 3-6-rayed ; pedicels filiform, half the length of the
rays of the umbel.—DC. mem. 1. c. t. 1 0 ./. A, Spprodr. 4. p. 107. Daucus
divaricatus, Walt. Car. p. 114. Sison pusillum, Michx. ft, I. p. 168 ; Ell.
sk. 1. p. 356. Ammi divaricatum & Ligusticum pusillum, Pers. syn. 1.
p. 308 Sf 315. TEthusa divaricata, Nutt. ! gen. 1. p. 190.
Dry sandy soils, South Carolina! and Georgia! March-April.—Stem 1-2
feet high, with spreading branches. Involucre wanting. Involucel of 2-3
minute leaflets. Rays of the umbel 8—14 lines long. Fruit muricated, as in
the preceding species.
4. L. patens (Nutt.): muricate with minute tubercles ; rays of the umbel
and umbellets- (4-8) very unequal, erect-spreading__Nutt.! in DC. prodr.
4. p. 107. - , . - : ; ' f
Prairies of Arkansas, Nuttall! Louisiana, Dr. Leavenworth! Texas,
Drummond!—Stem 1-2, feet high, branching above. Rays of the umbel
5-10 lines long, of the umbellets 2-4 lines.
5. L. echinatus (Nutt.): fruit echinate with spreading uncinate bristles;
rays of the umbel 4-6, of the umbellets 6-10, slightly diverging.—Nutt, in
DC. prodr. 4. p. 107.
Arkansas,^ Nuttall. Texas, Drummond! About a span high; the branches
somewhat rigid. Rays of the umbel 5-6 lines long, of the umbellets 2-3
lines. Fruit armed with stiff whitish bristles, which are distinctly uncinate.
10. BUPLEURUM. Tourn.; Linn.; Koch, Umb. p. 1 1 4 ./. 51 52;
DC. prodr 4; p. 127.
Margin of the calyx obsolete. Petals somewhat orbicular, entire, with a
broad closely inflexed retuse point.- Fruit laterally compressed or somewhat
didymous, crowned with the depressed stylopodium. Carpels with 5 ribs,
which are. either winged, acute, filiform, or obsolete; the lateral ones marginal.
Intervals with or,without Vittse, smooth or granulated. Seed teretely
convex, flattish on the face.—Herbaceous or shrubby glabrous plants.
Leaves rarely divided, usually by the- abortion of the limb and dilatation of
the petiole, changed into entire, phyllbdia. Involucres various. Flowers
yellow.
1. B. ranunculoides (Linn.)r ‘radical leaves linear-lanceolate; cauline
ones clasping, cordate-oblong, striate; involucre about 3-leaved, unequal;
leaflets of the involucel 5, ovate, mucronate, nerved, distinct. DC.__Linn.
spec. 1. p . 237 ; DC. prodr. 4. p .f 131; Hook. ft. Bor.-Afn. 1. p. 263. B. an-
gulosum, Sprehg. ;, Hook. Sf Am.' bot. Beechey; p. 124.
Cape Mulgrave in Behring’s Straits, Lay Sp Collie.
2. B. rotundifolium (Linn.): leaves broadly ovate, entire, perfoliate; involucre
none; involucels of 5 Ovate mucronate leaflets ; fruit with very
slender ribs; intervals smooth, mostly without vittas.—Linn. spec. 1. p. 236 •
Engl. bot. t. 99 ; Beck, bot. p. 145 Darlingt. ft. Cest. p. 191.
Fields and cultivated grounds, New York; Chester County, Pennsylvania.
Darlington; Orange County, North Carolina, Schweinitz.— (i) - Stem 1-2
feet high, branching. Leaves 1-2 inches long, glaucous beneath, perforated
by the stem excentrically. Umbels of 5—9 rays. Involucels rather longer
than the umbellets. Flowers greenish-yellow.—Modesty. Thorough-wax.
11. ClCUTA. L in n .; Lam. ill. t. 195 ; DC. prodr. 4. p. 99.
Margin of the calyx 5-toothed; the teeth somewhat foliaceons. Petals ob-
cordate; the point inflexed. Fruit ropndish, laterally contracted, didymous.
Carpels, with 5 flattish,equal ribs ; the, lateral ones marginal. Intervals filled
with single vitt®. Commissure with 2 vitt®. Carpophore 2-parted. Seed
77