&oos(Heterostephuni) in a memoir read before the American Philosophical Society
in? ther wanthlnf bel?nSed ln °" r opinion to Corethrogyne, notwithstand-
A ft e r s orifo n vL AP°n.tthe recePtacle and that they were the two doubtful
above’ and Califormca of De Candolle. Mr. Nuttall published theomne aocfc tohredmin gplryo basa bslpye cthiees Co.f
Corethrogyne one under the name of C. incana (supposing it to be the Diplopappus
anus, Llnal-)> Ae other as C. filagmifolia. Having since had the opportunity of
comparing original specimens of all these plants, our opinion, as regards the genus
Nmuutt, IanndA CC.7 Ca aelbiffnoSrmO cPae f(exCct’e pntidnege dt>hies cfhhae ffr eosfe mthbel alnacttee rb),e ttwhaete nw eA setiCll mstrcoan,g«ly;
iHs hhoowweevv eerr aa hd iffffe prern°,tV se ple°c biees ,* *p“e rshf ampes stPooec nieesa- r CT. hfeil aAg.i n1 iftoolmiae. ntellus, Hook. ^<f- Am.
§ 1. Receptacle with linear membranaceous chaffy scales intermixed among
the flowers, u su a lly, i f not always, w a nting in the centre o f the head.
1 . C. C a lifo rn ia (DC.): stems and simple branches very woolly, leafy :
leaves lmear-lanceolate, suberect; the lower ones lanceolate-oblong, taper-
ing to the base, sparingly toothed ; scales of the hemispherical involucre
glandular-viscid, with somewhat spreading tips; achenia densely silky-
c: ’ Hook. Sf A m . ! lot. Beechey, svppl. p . 350. ... ,I"°rma’ D o u g la s !—Leaves an inch or more in length, acute, woolly
hke the stem, resembling a Gnaphalium. Heads broad, three-fourths of an
inch m diameter. Scales of the involucre rigid; the innermost linear, as
long as the disk, scanous below; the exterior shorter, entirely herbaceous
and glandular-viscid externally, and also slightly woolly : the summit of the
branches likewise slightly glandular. Chaff of the receptacle narrow, sca-
xious, sometimes as long as the flowers and with herbaceous tips, but some of
them reduced to hyaline scales not more than twice the length of the achenia.
1 he achenia are densely clothed with very white and silky villous hairs
which project beyond the summit, so as to appear like a short exterior pappus:
bristles of the pappus unequal in size and length: the achenia of the ray
an abortive rudiment, with a pappus few or several, short, and very unequal
bristles, some of the stronger almost subulate: J 1
§ 2. Receptacle destitute of chaff.
., ^ y nf ana: (Nutt.): very woolly; stem very leafy, branching above-
the branches bearing 1 to 3 heads; leaves linear-lanceolate, suberect; the
lowermost oblong-lanceolate, tapering to the base, sparingly toothed ; scales
of the hemispherical involucre glandular-viscid, with somewhat spreading
tips; the exterior tomentose; achenia silky-canescent— Nutt.! in trans. Amer
phil. soc. (n. ser.) 7. p. 290, excl. syn.
St. Diego California, Nuttall! May— The ray-flowers (light bluish-
purple, Nutt.) present scarcely a trace of an ovary, and a rudimentary pappus
of only 3 or 4 very short bristles; the fertile achenia are clothed with
a rather shorter pubescence; the tuft of bristly hairs which crowns the
branches of the style is. not so strong as in the preceding species ; and there
are no chaffy scales on the receptacle: otherwise the two plants appear exactly
alike. It is said to exhale the heavy aromatic odor of some
specieslof Gnaphalium.—-The Diplopappus incanus, Lindl., referred here by
JNuttall, is a species of Dieteria. J
3. C. filaginifolia (Nutt.): clothed with a loose somewhat floccose and
deciduous wool; branches slender, rather naked above; lower leaves oblong-
spatulate or oblanceolate, very sharply or incisely serrate towards the apex
tapering into a short petiole; those of the branehlets lanceolate, sessile, often
entire, scattered ; scales of the somewhat obovoid involucre imbricated in 3
or 4 senes, acute, somewhat appressed, membranaceous, not glandular, at
first woolly-canescent, at length nearly glabrous ; achenia cuneiform-oblong,
compressed; silky-pubescent.—Nu tt.! 1. c. Aster? filaginifolius, Hook. Sf
A m .! hot. Beechey, p. 146. Diplopappus leucophyllus, Lindl. in DC.
prodr. 5. p. 278 ?
Monterey, California, Capt. Beechey! St. Barbara, Nuttall!—Plant more
slender and branched than the preceding, apparently slightly suflruticose at
the base; the pubescence similar, but looser and more deciduous. Heads
smaller; the scales of the involucre fewer, and not glandular or viscid. Pappus
of the ray almost none. Young achenia turbinate and silky-canescent;
when mature compressed and minutely silky-pubescent. The style resembles
that of the preceding species.
4. C. tomentella: stem shrubby at the base; the branches slender, woolly,
leafy to the summit; leaves (of the branches) appressed, linear or linear-
oblong, closely sessile ; those of the short branehlets or peduncles crowded,
very small and bract-like, passing into the oblong obtuse tomentose scales of
the somewhat turbinate involucre; achenia silky-canescent.—Aster ? tomentellus,
Hook. Sf Am. ! hot. Beechey, p. 146.
Monterey, California, Capt. Beechey! (v. sp. in herb. Hook.)—We have
seen but a single and imperfect specimen, which has still smaller heads
than C. filaginifolia : the oblong or slightly spatulate scales of the involucre
are pretty closely imbricated in 4 or 5 series, and gradually pass into the
very short bract-like leaves of the branehlets; they are somewhat membranaceous,
obtuse, but often sligfitly mucronulate; the tips somewhat
spreading. The leaves of the branches are small, densely woolly; the upper
oblong ; the lowest linear; those of the proper stem unknown.
24. DIETERIA. Nutt, in trans. Amer. phil. soc. 7. p . 300. (excl. spec.)
Heads many-flowered ; the ray-flowers numerous (10-30), in a single series,
pistillate ; those of the disk tubular, perfect. Scales of the obovoid or
turbinate involucre closely imbricated for the most part in several series,
linear, rigid, somewhat carinate, unequal, with herbaceous squarrose-spread-
ing or recurved tips. Receptacle flat, somewhat alveolate; the alveoli
toothed or lacerate. Rays linear;. the corolla of the disk cylindraceous, often
narrow, 5-toothed. Appendages of the style filiform-subulate or linear-lanceolate,
minutely hirsute. Achenia turbinate or cuneiform, often compressed,
pubescent or silky. Pappus of numerous scabrous and rather rigid capillary
bristles, very unequal (in 2 or 3 series); that of the ray similar but frequently
shorter and less copious.—Annual, biennial, or triennial herbs (natives of
arid or naked plains between the Mississippi and the Pacific), divaricately
branched, canescent or pulverulent-pubescent, or sometimes viscid. Leaves
rarely entire, usually pinnately toothed or pinnatifid, narrow; the eauline
sessile. Heads (often large) solitary or several on the corymbose or racemose
branches. Rays purple or violet, rarely ochroleucous ; the disk-flowers
yellow. Pappus tawny or brownish.
§ 1 . Scales of the involucre imbricated in several series, with short herbaceous
tips : leaves usually rigid, spinulose-toothed or pinnatifid, sometimes entire ;
the eauline linear, the radical lanceolate or spatulate {rays pistillate, but
sometimes infertile ?).—D i e t e r ia p r o p e r .