6.
Erigeron corymbosus
Nuttall, Trans. Amer. Philos. Soc., n. s. 7: 308. 1840.
Long-leaf fleabane
Perennials,
10—50 cm; taprooted, caudices usually with relatively slender and short, often woody branches.
Stems
ascending (often purplish proximally), hirsutulous (hairs spreading-deflexed), eglandular.
Leaves
basal (usually persistent) and cauline; basal blades linear-oblanceolate, (30—)60—160 × 3—8(—14) mm, cauline 3-nerved, gradually or little reduced distally (bases attenuate), margins entire (apices acute), faces hirsutulous, eglandular.
Heads
1—10(—16) in loosely corymbiform arrays (on branches from distal
1
/ 2 of stems, often well beyond middle).
Involucres
5—7 × 7—13 mm.
Phyllaries
in 2—3 series, flat, densely hirsute to hirsuto-villous, sometimes sparsely minutely glandular.
Ray florets
35—65; corollas blue or less commonly pink, 7—13 mm, laminae coiling at apices.
Disc corollas
4—5.3 mm.
Cypselae
2—2.5 mm, 2-nerved, faces sparsely strigose;
pappi:
outer of setae, inner of 20—30 bristles.
2
n
= 18.
Flowering Jun—Aug. Open slopes, grassland, sagebrush, rabbitbrush, openings in ponderosa pine; 400—2200 m; B.C.; Idaho, Mont., Oreg., Utah, Wash., Wyo.
