1. D. uliginosa (Nutt.! 1. c.) : decumbent, branching; leaves crowded
near the base, laciniate-pinnatifid ; the lobes linear; the rachis broad : rays
and scales of the involucre 8-12.
St. Barbara, California, Nuttall! April.—Plant 4-6 inches high, almost
aquatic. Lower leaves 2—3 inches long. Heads one-third to half an inch in
diameter, including tire short oblong rays. Scales of the pappus often somewhat
united ; the awns slightly dilated below, minutely serrulate-scabrous.
2. D. tenella (Nutt.! 1. c.) : stem erect, simple, slender; leaves linear;
the upper entire; the lower sparingly laciniate-pinnatifid towards the base;
rays and scales of the involucre 5-8.
St. Barbara, California, growing with D. uliginosa, Nuttall! April.—
Plant 3-4 inches high, resembling Burrieiia gracilis. Stem and leaves
hairy.
124. HYMENOXYS. Cass. diet. 55. p. 278; DC. prodr. 5. p. 661.
Heads many-flowered, discoid, or often radiate; the ray-flowers 8-10, li-
gulate, pistillate; those of the disk tubular, perfect. Scales of the involucre
in 1-2 series, appressed, nearly the length of the disk. Receptacle conical,
alveolate, mostly pilose or glandular. Corolla of the disk with a slender
(sometimes minutely glandular) tube, and an expanded 5-toothed/limb; the
lobes glabrous, or slightly bearded. Branches of the style short, truncate
and minutely barbellate at the apex. Achenia usually turbinate, and silky-
villous. Pappus of 5-12 unequal chaffy acuminate or awned scales, minutely
denticulate, mostly similar but often smaller in the ray (in § 2, awnless,
or entirely wanting!).—Annual or sometimes perrennial ? (South
American, Mexican, and Californian) branching nearly glabrous and minutely
glandular herbs, exhaling the odor of Chamomile, with rather small
showy heads terminating the branchlets. Leaves alternate or opposite in
the same plant, 1-2-pinnately parted into linear-filiform or almost capillary
segments. Flowers yellow.
§ 1. Heads radiate: scales of the pappus (at least in the disk-flowers) awned.
—Ox y pa ppu s, DC. (Ptilomeris, Nutt.)
1. H. Californica (Hook.): achenia fusiform, minutely strigose; pappus
of mostly 10 (8-12) small lanceolate or oblong denticulate-serrate scales; in
the disk-flowers terminated with long awns a little shorter than the corolla;
in the ray with 2-4 of the scales awned; the others awnless and smaller;
scales of the involucre lanceolate; leaves mostly opposite; the divisions
capillary ; the rachis often broad towards the base.—Hook. hot. mag. t.
3828. Ptilomeris aristata, Nutt. ! in trans. Amer. phil. soc. (n. ser.) 7. p . 382.
(3. coronaria: scales of the pappus of the ray small and acute, but all of
them awnless ; receptacle more hairy.—Ptilomeris coronaria, Nutt.! 1. c.
St. Diego, California, Nuttall! April.— ® Branched from the base, minutely
glandular-puberulent. Scales of the involucre somewhat embracing
the ray-achenia, which are a little incurved. Rays oblong, 2-3-toothed at
the apex. Achenia linear-obconical or fusiform. Receptacle pilose.—This
plant has been, we think, correctly referred by Hooker to Hymenoxys.
The two following species have precisely the same aspect, foliage, involucre,
&c., and can only be distinguished by the pappus.
§ 2. Heads radiate: pappus awnless, or none!—P t ilo p s is , Nutt. (Ptilomeris,
excl. spec, & § Ptilopsis, Nutt.)
2. H. mutica: scales of the pappus 6-8, oblong, truncate or obtuse, lacini-
ate at the summit, equal, shorter than the proper tube of the corolla ; that of
the ray smaller.—Ptilomeris mutica, Nutt. ! 1. c.
California, with the preceding, Nuttall.
3. H.calva: pappus of the ray and disk none.—Ptilomeris (Ptilopsis)
anthemoides, Nu tt.! 1. c.
California, with the preceding, and in no way distinguishable, apparently,
except by the achenium. Nuttall!
125. ACTINELLA. Pers. syn. 2. p. 469 ; Nutt. gen. 2. p . 173.
Actinea, Juss.—Ptilepida, Rafl—Picradenia, Hook.
Heads many-flowered; the ray-flowers 8-12, pistillate, ligulate, cuneate-
oblong, 3-toothed or lobed at the apex; those of the disk tubular, perfect.
Scales of the hemispherical involucre lanceolate or ovate, appressed, in 1-3
series, nearly equal, rather shorter than the disk. Receptacle hemispherical
or conical, naked. Corolla of the disk cylindraceous, with the proper tube
very short, 5-toothed ; the teeth erect glandular-bearded. Branches of the
style linear, truncate and barbellate at the apex. Achenia turbinate, short,
densely silky-villous. Pappus of 5-12 ovate or ovate-lanceolate membranaceous
1-nerved and awned scales with denticulate or eroded margins.—
Low chiefly perennial or suffruticose (American) plants; with the leaves
linear or lanceolate, entire or 2-3-parted, impressed-punctate; the cauline
alternate, sessile. Heads solitary, pedunculate. Flowers yellow, rarely
white ? sprinkled with bitter resinous globules.
* Caulescent: stems numerous from a thick caudex: leaves sparingly pinnateVy parted.
1. A. Richardsonii (Nutt.): puberulent; leaves petioled, rigid, irregularly
3-7-parted towards the summit; the segments glandular-punctate, filiform-
linear, entire, or the terminal one 2-toothed; scales of the involucre ovate-
lanceolate, in two series, the exterior united at the base; pappus of 5-7 ovate-
lanceolate cuspidate-awned scales.—Nutt.! in trans. Amer.phil. soc. (n. ser.)
7. p. 379. Picradenia Richardsonii, Hook.! fl. Bor.-Am. l .p . 317, t. 108;
DC. prodr. 5. p : 665.
About Carlton House, on the Saskatchawan, Richardson !—A span high,
rigid, branching above. Heads an inch in diameter, including the (8-10)
obovate-oblong yellow rays. Branches of the style flat, truncate and bearded
at the apex! Achenia clothed with long tawny villous hairs. Pappus
shorter than the corolla of the disk.
* * Caspitose, mostly dwarf and acaulescent: leaves crowded or rosulate, usually entire
: scapes simple, naked.
2. A . acaulis (Nutt.) : leaves densely clustered on the thick caudex, line-
ar-spatulate, silky-villous, as well as the scapes when young, and the involucre
; the scales of the latter lanceolate-oblong, in 2 series; scales of the