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.
140 +, 84 +  and 56 +
more or less tomentose +  and sericeous or glabrescent +
scarious +
mostly ovate +  and lanceovate or linear +
indeterminate +  and determinate +
Randall J. Bayer +
Greene +
4.8 cm48 mm <br />0.048 m <br /> (6.5 cm65 mm <br />0.065 m <br />) +
2.5 cm25 mm <br />0.025 m <br /> (4 cm40 mm <br />0.04 m <br />) +
0.9 cm9 mm <br />0.009 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
decurrent +
compound +  and simple +
spatulate;oblanceolate;spatulate;oblanceolate;linear;lanceolate;elliptic;cuneate +
5-ribbed +, 3-ribbed +  and 2-ribbed +
muriculate +, papillate +  and smooth +
2 cm20 mm <br />0.02 m <br /> (4 cm40 mm <br />0.04 m <br />) +
0.65 cm6.5 mm <br />0.0065 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
red +, yellow +  and white +
0.5 cm5 mm <br />0.005 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
papillate +
mostly ellipsoid +  and ovoid +
pistillate +  and staminate +
Alta. +, B.C. +, Ont. +, Sask. +, Yukon +, Calif. +, Colo. +, Idaho +, Minn. +, Mont. +, Oreg. +, S.Dak. +, Utah +, Wash. +, Wis. +  and Wyo. +
0–2200 m +
green-glabrous +  and tomentose +
papillate +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Pastures, dry fields, openings in deciduous woodlands and coniferous forests. and rock barrens +
in corymbiform , paniculiform , racemiform or subcapitate , arrays +  and singly +
indeterminate +
homogamous +  and heterogamous +
each +  and sessile +
pistillate +  and staminate +
0.3 cm3 mm <br />0.003 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
campanulate;cylindric +
0.6 cm6 mm <br />0.006 m <br /> (0.75 cm7.5 mm <br />0.0075 m <br />) +
sessile +  and petiolate +
cauline +  and basal +
rarely lanceovate +  and lanceolate +
2-carpellate +
persistent +
0.6 cm6 mm <br />0.006 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
Flowering mid spring–early summer. +
bearing subulate enations +, hairy +  and bristly +
flat;convex or ovoid +
exalbuminous +
appendaged +  and truncate +
papillate +
Antennaria callilepis +  and Antennaria exima +
Antennaria howellii subsp. howellii +
Antennaria howellii +
subspecies +
mucronate +
25 cm250 mm <br />0.25 m <br /> (70 cm700 mm <br />0.7 m <br />) +
4 cm40 mm <br />0.04 m <br /> (25 cm250 mm <br />0.25 m <br />) +