CARDUACEAE 1331 
to lanceolate or spatulate, acute; cauline leaves remote; blades sessile; in- 
e erect; bracts mostly acute or mucronate, purple-tinged, the outer 
ovate, the inner ho n or broadly linear, about 4 mm. dur achene 2-2.5 mm. 
fall. 
16. LACINIARIA Hill.1 Perennial, typically simple herbs with thick 
roots. Leaves alternate, often numerous; blades narrow, entire. Heads in 
spikes, racemes, panicles, or i? in cymes. Involucre ovoid to cylindric 
or turbinate: bracts few or many, imbricate, rarely petaloid. Corolla 
purple: throat narrow-funnelform, much longer than the slightly narrower 
tube: lobes lanceolate. Anther-appendages entire or notched. Achene shor rt, 
ribbed. Pappus of many barbellate or plumose bristles bu 40 species, : orth 
Ameriean.—BUTTON-SNAKEROOTS. DBLAZING-STARS. RATTLESNAKE-MASTER 
ran a plumose. 
Bra of ae involucre with dilated or petal-like, rose, (or white), apical ap- 
pe piace I. ELEGANTES. 
Bracts i ihe involucre not petal-like at the a 
d m. (16-60) -flowered : coro pla nee pubes: 
en II. SQUARROSAE. 
Hé: ads f (3.6) Fiat corolla-lobes glabrous, III. PUNCTATAE. 
BERIT bristles M di: 
B B olus acute, acuminate, or mucronate 
ee 
eee with recurved- -spreading tips. IV. PYCNOSTACHYAE. 
is with erect or a ppressed tips. 
Heads secund-spreading on the rachis. V. PAUCIFLORAE. 
Heads not secund, erect or appressed. VI. TENUIFOLIAE. 
Bracts of “the involucre obtuse or rounded at the apex 
(exe EON in No. 17). 
Involucre campanulate, nearly cylindric, or turbi- 
nate ; fen flowered. VII. SPICATAE. 
Involucre hemispheric ; i dd VIII. SCARIOSAE. 
I. ELE 
Petal-like tips of the involucral bracts men p" than 
wide, serrulate, acuminate, 1. L. elegans. 
Petal-like tips of the involucral bracts about as broad as 
ong, rounded and erose-denticulate, 2. L. flabellata. 
II. SQUARROSAE 
Stout plant with approximate cauline leaves and large 
m : 2: volucral bracts with rigid, acuminate, spread- 
ing 3. L.squarrosa. 
II. PUNCTATAE 
Slender plant with very narrow leaves: involucral bracts 
with slightly petaloid tips. 4. L. Boykinii. 
IV. PYCNOSTACHY 
molum braets with strongly recurved, small pee 
ti . L. pycnostachya, 
Tec icra bracts with slightly recurved, green tips. 6. L. chlorolepis. 
V. PAUCIFLORAE 
Stem oed acs glabrous: involucral bracts not glandular 
punctat T. L. pauciflora. 
Stem and “rachis pubescent: involucral bracts glandular 
punct 8. L. secunda. 
VI. TENUIFOLIA 
Leaves gradually decreasing in length from ie. base of 
the stem to the inflorescence. 
Bracts of 2 involucre linear or nearly so, usually long- 
acumin 9. L. Chapmanii. 
Bracts ah “the involucre, ovate-lanceolate, usually 
mucronate. 
1 Contributed by Edward J ohnston Alexander. 
