volucre much longer than the pappus, marked with very large dots. Rays
linear-oblong, bright yellow.
2. D. chrysanthemoides (Lagasca): puberulent or glabrous, diffusely
branched ; leaves opposite, pinnately parted ; the lobes linear, toothed or incised
towards the summit; heads terminating the paniculate leafy branchlets;
scales of the carnpanulate involucre united at thé base, scarious at the summit
; the involucriform bracts (about 8) linear, entire, ciliate at the base;
rays few, scarcely exceeding the involucre ; achenia pubescent; pappus as
long as the involucre, rather longer than the corolla; the scales dissected
into numerous slender bristles.—Lagasca, elench. hort. Madr. p. 29; DC. !
prodr. 5. p. 640. Dyssodia glandulosa, Cav. demonst. hot. p. 202, not of
Less. Tagetes papposa, Vent. hort. Cels. t. 36; Michx.! fl. 2. p. 132.
Boebera chrysanthemoides, W illd .! spec. 3. p. 2125; Pursh, Jl. 2. p. 559.
B. glandulosa, Pers. syn. 2. p. 459.
Banks of rivers, and on prairies, on the Mississippi and Missouri, and their
tributaries, from St. Pierre River ! and Illinois ! to Louisiana ! Aug.-Oct.
— (T) Plant about a foot high, exhaling a very strong ufipleasant odor.
Flowers golden yellow.—Willdenow gives Carolina and Florida as habitats
of this plant, doubtless incorrectly. It is also a Mexican species.
114. RIDDELLIA. Nutt, in trans. Amer. phil. soc. (n. ser.) 7. p . 371.
Heads many-flowered, radiate; the rays 3-5, ligulate, pistillate, dilated,
6-nerved, equally 3-lobed, persistent; the disk-flowers tubular, perfect. Involucre
cylindrical, composed of 8 scales united in a single series. Receptacle
small, naked. Corolla of the disk 5-toothed; the teeth glandular.
Appendages of the style subcapitate, obtuse, minutely pubescent. Achenia
“ slender and conic [obconical ?], prismatic, smooth.” Pappus of the ray
and disk similar, of 5-6 lanceolate acuminate nerveless chaffy scales.—A
slender branching aromatic herb, with alternate oblong-linear and somewhat
tomentose leaves;■ the branchlets corymbose, bearing 3-5 heads. Rays apparently
yellow, turning to reddish-orange. Involucre densely silky with
long hairs.
R. tagetina (Nutt. 1. c.)
“ In the southern range of the Rocky Mountains, towards the sources of
the Platte.—A very elegant plant, with the habit of a Zinnia, but having the
involucrum formed of a single series of united sepals. The rays are very
remarkable, appearing as rigid as parchment, and remain perfectly flat after
inflorescence, as in Zinnia.” Nuttall.—This geDus is dedicated to Prof. John
L . Riddell, formerly of Ohio, now of New Orleans; author of a Synopsis of
the Floraof the Western States, published at Cincinnati in 1835 (pp. 116, 8vo.),
and of a Supplementary Catalogue of Ohio Plants (1836). This plant is unknown
to us, and we have taken the character from Mr. Nuttall’s memoir.
So far as the description extends, it only differs from Tagetes in the persistent
rays, and the pubescence. We are not informed whether or not the
leaves present the large pellucid dots of the Tagetine®.
Subtribe 5. H e l e n ie®, Cass., DC.—Heads mostly beterogamous and radiate
; the disk-flowers perfect, but sometimes sterile. Receptacle naked or
chaffy. Anthers often blackish, the lobes frequently somewhat produced at
the base, but scarcely caudate. Pappus chaffy, the scarious scales several
or numerous, and distinct, or sometimes none.—Leaves alternate or opposite.
(Chiefly American.)
CONSPECTUS OP THE GENEKA.
Div. 1. Gaillardie®.—Receptacle not chaffy, nor deeply favose.
Subdiv. 1. Eugaillardie®.—Branches of the style long and filiform, hispid.
115. Gaillardia. Rays ligulate, neutral. Achenia obpyramidal, involucrate
with villous hairs. Pappus 1-nerved and awned.
116. Palafoxia. Rays ligulate, pistillate, or none. Achenia mostly slender.
Pappus 1-nerved, awnless.
117. C h®nactis. Rays, or exterior disk-flowers tubulose, inflated or palmate.
Achenia slender. Pappus nerveless.
Subdiv. 2. E uhelenie®.—Branches of the style obtuse or truncate.
* Rays ligulate, and fertile, or none.
+- Receptacle flat or flattish.
118. H ymenofapfus. Rays none. Achenia turbinate, substipitate, many-striate.
Scales of the pappus short and obtuse, 12-20. Involucre somewhat
petaloid, spreading.
119. Bahia. Rays 5-11. Achenia prismatic. Scales o f the pappus 4-10, ob-
- long. Involucre appressed.
120. A ctinolepis. Rays 3-5. Achenia terete. Pappus of the disk none, in the
ray of 10-15 narrow acute scales.
+- -f— Receptacle conical, convex, or oblong.
121. L asthenia. Scales of the involucre united! Pappus of 5-10 scales, or
sometimes none!
122. Burriema. Receptacle conical, papillose. Scales of the pappus equal, n a rrow,
subulate-awned, or sometimes none!
123. D ich®ta. Receptacle conical, alveolate-toothed. Scales of the pappus 4-8
oblong and obtuse, and about 2, which are subulate-awned.
124. H ymenoxys. Receptacle conical, alveolate. Scales of, the pappus 5-12
oblong or lanceolate, acumiihte or awned, rarely obtuse or none!
Lobes of the disk-corolla nearly glabrous.
125. A ctinella. Receptacle hemispherical or conical, naked. Scales of the
involucre ovate or lanceolate, appressed. Lobes of the disk-corolla
glandular-bearded. Scales of the pappus 5-12, ovate, 1-nerved,
awned.
126. Amblyolepis. Receptacle flattish, alveolate. Scales of the involucre ovate
appressed. Scales of the pappus 5, obtuse, nerveless.
127. H elenium. Receptacle convex or oblong, naked. Scales of the involucre
linear or subulate, spreading or reflexed. Lobes of the disk-corolla
glandular-bearded. Scales of the pappus 5-8, apiculate or awned.
* * Pays neutral.
128. L eptopoda. Receptacle conical or hemispherical, areolate. Scales o f the
p appus mostly nerveless an d awnless, denticulate or fimbriate.