Part 3, 1916] CARDUACEAE: TAGETEAE 
Leaves narrow, less than 2 mm. broad; involucre about 
1 em. high; bracts narrowly linear. 
Leaves more than 2 mm. broad; involucre 8-9 mm. high; 
bracts broader. 
Heads longer-peduncled, in open cymes or solitary; bracts more 
or less pink or purplish, round-keeled on the back and 
gibbous at the base. 
Plants decumbent; leaves oblong, rarely more than 1 cm. 
long; heads short-peduncied, nodding. 
Plants erect; leaves various, more than | cm. long; heads not 
nodding. 
Corollas Shite or pale; leaves often obtuse. 
Corollas more or less purple. 
Leaves elliptic or oblong, obtuse. 
Leaf-blades more than 1 cm. long; bracts acute; 
peduncles elongate. 
Leaf-blades less than 1 cm. long; bracts acuminate; 
peduncles short. 
Leaves narrowly oblanceolate to linear, acute. 
Bracts merely purple or purple-tinged, not dotted, 
acute. 
Annuals. 
Perennials. 
Leaves linear. 
Leaves oblong or oblanceolate. 
Leaves 2-5 em. long; heads solitary or 
in clusters of 2 or 3 at the ends of the 
branches. 
Leaves 1-2 (rarely 3) cm. long; heads 
cymose. 
Bracts conspicuously purple-dotted, acuminate. 
Leaves filiform or nearly so. 
Leaves not fleshy; branches mostly erect. 
Bracts obovate, rounded or truncate at the apex, keeled only 
at the base, purple; corollas purple. 
Bracts linear or oblong, acute or obtuse, round-keeled on 
the back. 
Corollas purple, slightly tinged with orange on the lobes; 
heads nodding. 
Corollas white or straw-colored, merely streaked with 
purple on the throat, if at all. 
Glands of the involucral bracts narrow, linear. 
Plants decidedly glaucous; bracts only ‘slightly 
pinkish on the margins; achenes light-colored. 
Plants scarcely glaucous; bracts more or less purple- 
tinged; achenes dark. 
Plants shrubby; achenes sparingly hispidulous; 
bracts linear. 
Plants herbaceous from a subterranean cespitose 
stem; achenes hirsute; bracts oblong-linear. 
Glands of the involucral bracts short, oblong or elliptic. 
Bracts broadly linear or oblong-oblanceolate; 
leaves rather stiff and fleshy; plants glaucous. 
Bracts narrowly linear; leaves slender and soft; 
plants light-green. 
Leaves decidedly fleshy; branches divaricate. 
Throat of the corolla cylindric or nearly so, longer than the tube; lobes 
short, ovate; corollas mostly yellow (PSEUDO-CHRYSACTINIA). 
Leaves lanceolate, amplexicaul. 
Leaves not amplexicaul, sessile, linear, oblong, or cuneate. 
— the bracts in dorsal lines; plants not depressed; leaves 
iform. 
Bracts linear, acute, with linear glands. 
Branches erect or ascending; leaves more than 2 cm. long. 
Branches ing, flexuose; leaves 1-1.5 cm. long. 
Bracts oblong or oblong-obovate, obtuse or rounded at the apex; 
branches flexuose. 
Glands of the oval or obovate bracts near the apex only; plants low 
and depressed. 
Leaves linear, simple. 
Leaves cuneate in outline, 3-lobed at the apex. 
28. 
29. 
183 
P. confertum. 
. ochroleucum. 
. cedrense. 
. obtusifolium. 
. Nelsonit. 
- Pittieri. 
. coloratum, 
. Linaria. 
. Seemannii. 
. guatemalense. 
. simplex. 
P. filiforme. 
30. P. porfyreum. 
a1; 
38. 
39. 
P. leucospermum. 
. P. gracile. 
P. Vaseyi. 
. P. junciforme. 
. P. pinifolium. 
P. maritimum. 
P. amplexicaule. 
P. scoparium. 
P. fruticulosum. 
. P. Greggii. 
41. 
42. 
1. Porophyllum macrocephalum DC. Prodr. 5: 648. 
Kleinia glandulosa Moc. & Sessé; DC. Prodr. 5: 648, as synonym, 1836. 
P. crassifolium. 
P. tridentatum. 
1836. 
An erect annual; stem 5-10 dm. high, glabrous, branched above; leaves alternate; 
petioles slender, 1-2 cm. long; blades broadly oval or obovate, repand, 1-3 em. long, thin and 
