2. C . montanus (Nutt.! mss. under Phellopterus): “ somewhat glaucous ;
leaves bipinnately divided; segments oblong-linear, rather obtuse; involucels
7-9-parted, membranaceous; the segments oblong, obtuse.”
High bare plains of the Platte, towards the Rocky Mountains, Nuttall!—
Plant 2-3 inches high ; the caudex about an inch long. Leaf with an ovate
outline; the segments rather few and distant. Peduncles shorter than the leaves.
Flowers white* nearly sessile in the umbellets, many of them abortive.
Involucels nearly as long as the umbellets. Fruit 34 lines long; the integuments
thick and opaque, so as to conceal the vittae : wings rather thin ; the
alternal dorsal ones often defective, as in the preceding species : intervals
with 2—3 vittae.
3. C. glaums (Nutt.): “ glaucous; sheaths at the base of the caudex
wide and inflated; leaves bipinnately divided; the segments crowded,
ovate, toothed; involucels about 3-parted, the segments linear-subulate.—
Nutt. ! in jour. acad. Philad. 7. p. 28. Phellopterus glaucus, Nutt.! mss.
Borders of Flat Head River, towards the sources of the Oregon. Mr.
Wyeth! April.—Plant 3-4 inches high. “ Root large, descending.” Caudex
1-24 inches high, usually clothed with large sheathing stipules without
leaves ; the summit bearing the leaves and flowers. Leaves with a somewhat
cordate outline, about twice the length of the peduncles^ Flowers
yellowish when dry (probably white in the living state). Fruit not seen.
§ 3. Calyx-teeth minute: involucels minute: uAngs of the fruit somewhat
thickened and spongy, the alternate ones obsolete : commissure with 6 vittce:
carpophore free, 2-parted.—L eptocnemia, Nutt. mss.
_ 4. C. campestris (Nutt._! mss. under Leptocnemia): leaves 3-parted ; the
divisions remote, bipinnatifid ; segments oblong.
Plains of the Platte, near the Rocky Mountains. Nuttall.—“ Root tuberous.
Plant about 2 inches high. Caudex one-third of an inch high.
Umbel 3-4-rayed. Peduncle scarcely as long as the leaves.”—Scarcely
differs from some of the smallest specimens of C. glomerate, except by the
broader segments of the leaves, and the free carpophore.
§ 4. Calyx-teeth distinct, lanceolate: wings of the carpels broad: commissure
with 4-10 vittee: carpophore free, 2-parted.—P teryxia, Nutt. mss.
5. C. terebinthinus: leaves pinnately decompound, rigid, glaucous; the
„segments short, deeply and acutely lobed and toothed; peduncles elongated;
carpels with 5 perfect wings ; vittae of the commissure 8-10, of the intervals
4.—Selinum terebinthinum, Hook. fi. Bor.-Am. 1. p. 266, t. 95. Pteryxia
terebinthacea, Nutt.! mss.
Sandy grounds on the Wallawallah River, Oregon, Douglas. Rocky
places towards the Blue Mountains, Nuttall!—“ Root fusiform, thick, exuding
a copious turpentine.” Dougl. Caudex short, firm, scarcely branched.
Leaves 6-8 inches long. Peduncles (in fruit) nearly a foot long. Rays of
the Umbel about 10, unequal; the longest nearly 2 inches in length. “ Teeth
of the_ calyx somewhat foliaceous, deciduous.” Hook. Fruit oval, about
one-third of an inch long ; wings thin ; the dorsal about half as broad as the
marginal ones. Flowers not seen.
6. C. fceniculaceus (Nutt.! mss. under Pteryxia): “ leaves pinnately decompound
; the segments short and linear, acute ; carpels with 5 perfect
wings ; vittae of the commissure 4-6.”
On rocks, Blue Mountains of Oregon, Nuttall /—“ Less than a foot high.
Leaves with narrow sheaths, on rather long petioles. Umbel small, of 8-10
rays. Petals lanceolate, with a long incurved point. Involucels very short.
Flowers yellow. Wings of the carpels thin, scarcely undulated; the intervals
with 3-4 vittae.—Scarcely distinct from the preceding species.
7. C. albiflorus (Nutt.! mss. under Pteryxia): “ somewhat glaucous;
stem low, branching at the base; leaves pinnately decompound; the ultimate
segments divaricate and often 3-cleft, short, acute; involucels about
7-parted, nearly as long as the flowering umbels; carpels with 5 undulate
wings ; vittae of the commissure 6.”
“ Hills of Bear River, in the Rocky Mountain range.—Allied to the preceding
; but the segments of the leaves are much 'wider and divaricate; the
flowers are also white, and the involucels conspicuous. Petals lanceolate
with an acuminate point. Styles long and filiform. Fruit roundish-oval;
the wings undulate, thickish and corky, so as almost to conceal the intervals.”
Nuttall.
8. C. thapsoides (Nutt. mss. under Pteryxia): glaucous; leaves pinnately
decompound, the divisions confluent; segments short, linear, obtuse, not
wider than the rachis; involucels 5-7-parted, the lobes lanceolate ; fruit
öblóng-oval, with narrow dorsal Wings; vittae of the commissure 8. '
“ Rocky places in the Blue Mountains of Oregon.—Allied to C. foenicu-
Iaceus, but with very different fruit. About a span high; the root tuberous
and tap-shaped. Petals lanceolate, with an inflexed point. Wings of the
fruit yellowish. Vittas of the lateral intervals 4, of the dorsal ones 3. The
plant exudes an aromatic resin.” Nuttall.—We have received no specimens
of this species, which is perhaps too near C. terebinthinus.
T r ib e VI. PEUCEDANEiE. DC.
■ Fruit more or less compressed dorsally, surrounded with a
single dilated entire smooth margin, which is flattened or slightly
convex, but not thickened a t the edge. Carpels with 5 filiform or
rarely winged ribs, of which the lateral ones are contiguous to the
dilated margin or united with it. Seed flattened, or convex on the
back.
26. PEUCEDANUM. Koch, Umb. f . 28 Sf 2 9 ; DC. prodr. 4. p. 176.
Margin of the calyx minutely 5-toothed. Petals obovate, emarginate or
entire, the point inflexed. Fruit flatly or lenticularly compressed on the
back, with a flat dilated or winged border. Carpels with 5 equidistant ribs;
the 3 dorsal ones filiform; the lateral ones indistinct, contiguous to the
margin, or dilated into the wings. Intervals usually With single vittas; the
lateral ones sometimes with 2 or 3 vittae, Commissure with 2-4- (rarely. 6-)
■vittse. Carpophore 2-parted, Seed flat or slightly concave on the face.__
Herbaceous mostly perennial and glabrous plants. Leaves temately or
pinnately divided or decompound. Involucre various. Involucels manyleaved.
Flowers White, yellow, or yellowish-green.
* Involucre and involucels none: flowers yellow: calyx-teeth obsolete: leaves
temately or 2-3-ternately divided.
I- P- latifolium (Nutt.! mss.): stemless and dwarfish; leaves temately
or biternately divided; segments broadly ovate, obtuse, toothed at the apex,
79