464 COMPOSITE. C haftalia.
herbs, with naked scapes bearing solitary heads; the leaves all radical,
tomentose beneath. Flowers white or purplish.
1 . C. tomentosa (Vent. 1. c .) : leaves oblong or nearly lanceolate, somewhat
petioled, retrorsely denticulate ; the lower surface and the slender scape
densely tomentose with a white matted wool; the upper arachnoid when
young, at length glabrous; head nodding when in flower; exterior rays
16-20, simply ligulate.—Pursh ! fl. 2. p. 577 ; Bot. mag. t. 2257 ; Ell. sk.
2. p. 459 ; DC.! prodr. 7. p. 41. Perdicium semiflosculare, Walt. ! Car.
p. 204. Tussilago integrifolia, Willd. ! spec. 3. p. 1964; Michx.! fl. 2.
p . 121.
Damp pine barrens, &c. North Carolina! to Florida! and Louisiana t
March-May. Scape a span to a foot high.
T ribe VII. NASSAUVIACEtE. Less.
Heads homogamous, radiatiform ; the flowers all similar and perfect.
Style nearly as in the Senecionese.
176. ACOURTIA. Don, in trans. Linn. soc. 16. p. 203; DC. prodr. p. 65.
Heads 10-30-flowered, discoid, homogamous ; the flowers perfect. Involucre
turbinate ; the scales imbricated in several series, lanceolate, appressed,
dilated at the base, articulated with the rachis, deciduous! Receptacle
naked. Corolla of all the flowers bilabiate; the outer lip ligulate and 3-
toothed; the inner 2-parted, with the revolute lobes linear and obtuse. Anthers
tipped with a linear-lanceolate cartilaginous appendage; the tails simple
and obtuse. Branches of the style truncate,^papillose at the apex.
Achenia nearly terete, elongated, papillose-scabrous. Pappus a single series
of bristles, penicillate at the apex, deciduous.—Shrubby (Mexican and
Californian) branching glaucous plants, with the habit of Serratula. Leaves
cordate-clasping, with the auricles free, spinulose-serrate. Heads 3-10, fasciculate
corymbose : scales of the involucre often reddish, ciliate. Corolla
purple or rose-color; pappus white. DC.
1 . A . microcephala (DC.): stem herbaceous ? branching; the branches
angular, somewhat velvety with a , glandular pubescenee; leaves cordate-
clasping, ovate, acute, sharply toothed, glandular, somewhat puberulent
beneath; heads several in a thyrsoid corymb; scales of the involucre
mucronate-acuminate, glandular-puberulent on the back. DC. 1. c.
California, Douglas.—This and the Chaptalia are the only North American
representatives of a suborder, which is eminently characteristic of the
western portion of South America.
S u b o k d e b III. LIGULIFLORaE. DC.
Flowers all ligulate and perfect, disposed in a homogamous radiatiform
head. Pollen scabrous and many-sided, usually dodecahedral.
T ribe VIII. CICHORACEJE. Vaill., Juss.
Style cylindraceous above, the summit as well as the rather obtuse
branches uniformly pubescent; the stigmatic lines terminating below
or near the middle of the branches.—Plants with a milky juice !
Leaves alternate.
CONSPECTUS OF TH E GENE BA.
Subtribe 1. L ampsaneaE.—Pappus none. Receptacle not chaffy.
177. L ampsana. Achenia obscurely striate. Involucre erect. Heads paniculate.
178. A pogon. Achenia many-ribbed. Involucre connivent in fruit. Heads solitary
or umbellate. Cauline leaves often opposite.
Subtribe 2. HyosebideaE.—Pappus either wholly or partly chaffy or squamellate.
Receptacle not chaffy.
* Involucre simple, equal, scarcely in 2 series.
179. K rigia. Pappus of 5 broad chaffy scales and 5 alternate bristles.
180. C ynthia. Pappus of numerous short squamellae and capillary bristles.
* * Involucre double or imbricated.
181. S corzonella. Pappus of 10 short chaffy scales, bearing long capillary awns.
182. C alais. Pappus of 5 elongated and scarious (often bifid) awned scales.
183. Cichorium. Pappus very small, multi-squamellate. Flowers blue !
Subtribe 3. S corzonereae.—Pappus setose, or plumose. Receptacle not chaffy.
184. Stephanomeria. Achenia truncate. Pappus plumose. Heads 3-6-flowered.
185. R afinesquia. Achenia rostrate. Pappus plumose. Heads many-flowered.
186. L eontodon. Achenia fusiform or slightly rostrate. Pappus plumose.
Heads many-flowered.
Subtribe 4. LactuceaE.—Pappus capillary, not plumose. Receptacle not chaffy.
* Pappus dirty white or tawny, fragile. Achenia not rostrate.
187. A pargidium. Pappus barbellate, in a single series. Heads many-flowered.
188. H ieracicjm. Pappus scabrous, in a single series. Heads 20-many-flowered
(yellow). Achenia oblong or columnar.
189. N abalus. Pappus scabrous, copious. Heads 5-30-flowered (ochroleucous,
whitish, or purplish), nodding. Achenia linear-oblong, cylindrical.
190. L ygodesmia. Pappus scarcely scabrous, very copious. Heads 5-10-flowered
(rose-purple), erect. Achenia linear, elongated.
* * Pappus bright white (except in Pyrrhopappus and a single Mulgedium).
+- Achenia terete or angled, not evidently compressed nor rostrate.
191. M alacothrix. Pappus in a single series, soft; the bristles sparingly barbellate
near the base. Achenia short, truncate.
VOL. ii.—59