Antennaria howellii subsp. howellii

Endemic
Synonyms: Antennaria callilepis Greene Antennaria exima Greene
Treatment appears in FNA Volume 19. Treatment on page 404. Mentioned on page 390, 405.

Plants 15–30 cm. Stolons 1–4 cm. Basal leaves 1–3-nerved, spatulate to oblanceolate, 25–40 × 9–12 mm, tips mucronate, faces abaxially tomentose, adaxially green-glabrous. Cauline leaves linear, 20–40 mm, not flagged. Heads 5–12 in corymbiform arrays. Involucres: staminate unknown; pistillate 6–7.5 mm. Phyllaries distally light brown or white. Corollas: pistillate 5–6 mm. Cypselae 1.5–2 mm, notably papillate; pappi: pistillate 6–8 mm. 2n = 56, 84, 140 (under A. neodioica).


Phenology: Flowering mid spring–early summer.
Habitat: Pastures, dry fields, openings in deciduous woodlands and coniferous forests. and rock barrens
Elevation: 0–2200 m

Distribution

V19-650-distribution-map.gif

Alta., B.C., Ont., Sask., Yukon, Calif., Colo., Idaho, Minn., Mont., Oreg., S.Dak., Utah, Wash., Wis., Wyo.

Discussion

Subspecies howellii is most common in the western half of the range of Antennaria howellii. Based on morphology, this group of apomicts is closely related to A. racemosa of the northern Rockies (R. J. Bayer 1985) and, perhaps, to A. marginata of the southern Rockies.

Selected References

None.

Lower Taxa

None.
Randall J. Bayer +
Greene +
Alta. +, B.C. +, Ont. +, Sask. +, Yukon +, Calif. +, Colo. +, Idaho +, Minn. +, Mont. +, Oreg. +, S.Dak. +, Utah +, Wash. +, Wis. +  and Wyo. +
0–2200 m +
Pastures, dry fields, openings in deciduous woodlands and coniferous forests. and rock barrens +
Flowering mid spring–early summer. +
Antennaria callilepis +  and Antennaria exima +
Antennaria howellii subsp. howellii +
Antennaria howellii +
subspecies +