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Hieracium albiflorum
Hook.
(redirected from:
Hieracium helleri
Gand.)
Family:
Asteraceae
White-Flower Hawkweed
[
Chlorocrepis albiflora
(Hook.) W.A.Weber,
more
Hieracium helleri
Gand.,
Hieracium siskiyouense
M.Peck
]
FNA
Resources
John L. Strother in Flora of North America (vol. 19, 20 and 21)
Plants
15-40(-90) cm.
Stems
proximally usually piloso-hirsute (hairs 1-6+ mm), rarely glabrous, distally glabrous.
Leaves:
basal (0-)3-8+, cauline 1-5(-12+); blades oblanceolate, 40-100(-300) × 12-30(-60+) mm, lengths 3-5+ times widths, bases cuneate, margins usually entire, sometimes sinuately toothed, apices obtuse to acute, faces piloso-hirsute (hairs 1-6 mm), rarely glabrous.
Heads
(3-)12-50+ in corymbiform to paniculiform arrays.
Peduncles
usually glabrous, sometimes stipitate-glandular.
Calyculi:
bractlets 5-12+.
Involucres
± campanulate, (7-)8-10(-11) mm.
Phyllaries
8-13+, apices acuminate, abaxial faces piloso-hirsute (hairs 1-2+ mm), stellate-pubescent, and stipitate-glandular.
Florets
(6-)12-25+; corollas yellow, 9-10 mm.
Cypselae
columnar, 2.5-4 mm;
pappi
of 30-40+, stramineous bristles in ± 2 series, (4-)5-7 mm.
Flowering (May-)Jun-Sep. Chaparral, conifer forests, meadows, stream beds, serpentines, volcanics, around mineral springs; 10-2900 m; Alta., B.C., N.W.T., Que., Sask.; Alaska, Calif., Colo., Idaho, Mont., Nev., Oreg., S.Dak., Utah, Wash., Wis., Wyo.; Mexico (Chihuahua, Sonora).
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