Hasteola

Rafinesque

New Fl. 4: 79. 1838

Etymology: Latin hasta, spear, and - ola, diminutive, alluding to leaves of type species
Treatment appears in FNA Volume 20. Treatment on page 610. Mentioned on page 543, 611.
Perennials, (50–)60–240 cm. Stems usually 1, erect (unbranched proximal to heads). Leaves basal and cauline; alternate; petiolate (proximal) or sessile; blades pinnately nerved, broadly deltate or hastate (proximal) to broadly lanceolate, margins doubly-serrate, faces glabrous. Heads discoid, in corymbiform (± flat-topped) arrays. Calyculi of 4–9+ (subulate, rarely leaflike) bractlets. Involucres cylindric or campanulate to obconic, 5–8+ mm diam. (glabrous). Phyllaries persistent, 7–14+ in 1–2 series, erect, distinct, oblong, ± equal, margins chartaceous to scarious. Receptacles slightly convex or flat, foveolate, epaleate. Ray florets 0. Disc florets 10–55, bisexual, fertile; corollas usually white or ochroleucous to greenish, rarely pinkish, tubes longer than cylindric throats, lobes 5, erect to spreading, lanceolate; style branches stigmatic in 2 lines, apices truncate or truncate-penicillate (appendages essentially 0). Cypselae cylindric-fusiform, 8–12-ribbed, glabrous; pappi persistent (fragile), of 100–150+, white, barbellulate bristles. x = 10.

Distribution

e United States.

Discussion

Species 2 (2 in the flora).

Asian species that have been assigned to Hasteola belong to Parasenecio.

Lower Taxa

Key

1 Florets 10–14; proximal cauline leaves deltate Hasteola robertiorum
1 Florets 18–55; proximal cauline leaves hastate to deltate or lanceolate Hasteola suaveolens