‘COMPOSIT AL CROCIDIUM 
TETRADYMIA 
cle flat, naked, bearing 4 to 6 tubular flowers ; these with narrow 
cylindric proper tube rather longer than the combined narrow 
throat and long linear segments. Achenes prismatic, glabrous, 
surmounted by a rather coarse pappus of firm sorded or brown- 
ish bristles which are smooth except at the slightly thickened 
and scabrous apex. ” 
370 
R. stricta Greene |. c. Prenanthes stricta Greene. Luina Piperi Robinson. 
‘‘ Perennial, 2 feet high from simple or branching horizontal rootstocks, 
glabrous, bright green, not glaucous: radical leaves 6-10 inches long, oblong- 
lanceolate, tapering to a winged petiole, abruptly acuminate, coarsely and 
repandly dentate; cauline similar but smaller, rather numerous: inflorescence 
a strict and dense simple raceme 6 inches long; heads erect, their short ped- 
icels single or in pairs; scales of the cylindrical involucre about 8, purplish 
and with some white tomentose pubescence, calyculate bracts obscure or none: 
achenes equally and obtusely 15-ribbed; pappus pale-fuscous. Dry north- 
ward slopes, in rocky soil at the limit of trees on Mount Rainier Wash. ” 
* *. Style-branches of hermaphrodite flowers either truncate or 
capitellate at tip, which is either naked or penicillate or hirsute and 
not rarely bearing a short conical or flattened appendage. 
+ Involucre lax, usually of much overlapping or unequal bracts. 
82 CROCIDIUM Hook. FI. i, 335, t. 118. 
Small winter annual herbs with alternate leaves and yellow 
flowers on scape-like stems in early spring. Heads heterogamous, 
radiate, the flowers all fertile. Involucre hemispherical or more 
‘open, of 8-12 nearly equal thin-herhaceous bracts. Receptacle 
conical. Ray-flowers about 12, oblong, with short filiform tube ; 
disk-flowers with slender tube and campanulate 5-toothed limb 
Anthers with deltoid-ovate acute tips. Branches of the style short 
and broad, term inated by large deltoid appendages. Achenes fusi- 
form-oblong, obscurely 3-5-costate, beset with hyaline oblong pa- 
pille, which detaching when wetted throw out a pair of spiral 
threads. Pappus a single series of equal white barbellate bristles 
which are very deciduous, commonly wanting in the ray-flowers. 
C. multicaule Hook. l.c. Flocculent woolly when young, soon most- 
ly glabrate, producing many simple stems 2-10 inches long !rom the tuft 
of obovate or spatulate few-toothed sessile or short-petioled radical leaves ; 
cauline leaves small, lanceolate to linear: heads solitary, slender-peduncel- 
ed rather small but showy: bracts of the involucre oblong-ovate. Moist 
places, Brit. Columbia to California and Idaho. 
+ + Involucre of 4-6 firm and concave close and strongly over- 
lapping bracts, 4-9 flowered. Shrubs with alternate leaves. 
- 83 TETRADYMIA DC. Prodr. vi. 440. 
Low and rigid shrubs with alternate or fascicled narrow entire 
leaves and rather large cymose or clustered heads of yellow flow- 
ers. Heads homogamous, the flowers all tubular and perfect. 
Involucre cylindrical to oblong Receptacle flat. Corollas with 
elongated tube and lanceolate or linear spreading lobes longer 
