13.
Brickellia eupatorioides
(Linnaeus) Shinners, Sida. 4: 274. 1971.
Kuhnia eupatorioides
Linnaeus, Sp. Pl. ed. 2, 2: 1662. 1763
Perennials,
30—200 cm (bases woody).
Stems
branched, pubescent.
Leaves
mostly opposite (alternate in vars.
gracillima
and
texana
); petioles 0—10 mm; blades 1- or 3-nerved from bases, lanceolate, lance-linear, lance-ovate, lance-rhombic, linear, or oblong, 25—100 × 0.5—40 mm, bases acute, margins entire or ± dentate (often revolute), apices obtuse to acuminate, faces glandular-pubescent.
Heads
in paniculiform or corymbiform arrays.
Peduncles
5—100 mm, glandular-pubescent.
Involucres
cylindric to narrowly campanulate, 7—15 mm.
Phyllaries
22—26 in 4—6 series, green to stramineous, sometimes purple-tinged, 3—7-striate, unequal, margins scarious (often ciliate); outer ovate to lance-ovate (puberulent, often densely gland-dotted, apices acute to acuminate), inner lanceolate (± gland-dotted, apices obtuse to aristate).
Florets
6—35; corollas pale yellow, yellow-green, pinkish lavender, or maroon, 4.5—6 mm.
Cypselae
2.7—5.5 mm, glabrous or strigose, sometimes hispidulous or velutinous and/or gland-dotted;
pappi
of 20—28 white or tawny, usually plumose or subplumose, sometimes barbellate, bristles.
Varieties 6 (6 in the flora): United States, Mexico.
