Flora of the Canadian Arctic Archipelago
French: Antennaire alpine.
Asteraceae (Compositae), Daisy family.
Published in Rhodora 100: 63. 1998.
Type: Greenland: Danmarks Insel, ca. 70°30'N, 08.1892, leg. Hartz. Holotype: C.
Synonymy. Antennaria porsildii E.Ekman, Svensk Bot. Tidskr. 21: 51. 1927.
Antennaria canescens (Lange) Malte subsp. porsildii (E. Ekman) Á. Löve and D. Löve, Bot. Not. 128: 519. 1976.
?Antennaria alpina (L.) Gaertn. var. glabrata J. Vahl, Fl. Dan. 47, t. 2786, fig. 4. 1869.
?Antennaria glabrata (J. Vahl) Greene, Pittonia 3: 285. 1898.
?Antennaria nitens Greene, Ottawa Natural. 25: 42. 1911.
Vegetative morphology. Plants 5–6 cm high (single specimen); perennial herbs; caespitose, or not caespitose. Only fibrous roots present (fibrous roots arising from the underground stem). Ground level or underground stems vertical; compact; not visible. Caudex present (but very little collected in the specimen). Aerial stems developed; erect. Leaves mainly basal; alternate; marcescent. Petioles absent. Leaf blade bases truncate, or attenuate. Blades 8–15 mm long, 1.2–1.8 mm wide, spreading, oblanceolate, flat, appearing single-veined. Blade adaxial surface dull, glabrous. Blade abaxial surface glabrous (basal leaves) or hairy (flowering stem leaves), hairs long-silky, hairs moderately dense, hairs white, hairs curved, hairs spreading. Blade apices acuminate (almost apiculate).
Reproductive morphology. Plants dioecious (male plants unknown). Flowering stems with leaves. Flowering stems hairy. Flowering stems long-silky. Flowering stem hairs simple; white or translucent. Inflorescences solitary heads, or of several flowering heads; globose or sub-globose; 1–1.2 cm long; 10–20 mm wide. Flowering heads 8–12 mm deep; 12–14 mm wide; with only disc florets. Pedicels absent, or subtending flowering heads (when second capitulum is present); with non-glandular hairs. Involucral bracts present. Number of rows 2–3. Outer involucral bracts mostly green (drying brown; tips attenuate or acute); lying adjacent to the flowers; lanceolate; 6–7 mm high; 1.2–1.6 mm wide; glabrous (almost), or sparsely hairy; without glandular hairs. Inner involucral bracts lanceolate; 6–6.5 mm high; 0.6–0.8 mm wide; margins wide, scarious for at least one quarter of the bract (towards apex); apex entire (not flag-like). Flowers radially symmetrical (actinomorphic); unisexual. Sepals represented by a pappus. Pappus with a single row of hairs; whitish. Disc florets pappus 5.8–6.2 mm long. Petals conventional; fused; longer than the calyx; 5; white, or brown (pale); 4.5–4.7 mm long. Corolla tubular; 5-lobed. Stamens absent. Ovary inferior; carpels 2; syncarpous. Styles 1; 3.8–4 mm long. Stigmas per ovary 2. Placentation basal. Ovules per ovary 1. Fruit sessile; dry; cypselas (specimen collected 16–17 August; cypselas not mature); indehiscent. Seeds 1.
Chromosome information. 2n = 56, 63, and 70.
2n (8x ) = 56. Dalgaard (1989, western Greenland, for A. glabrata);
2n (9x) = 63. Nygren (1950c), A. porsildii); Böcher and Larsen (1950, Greenland, for A. glabrata); Böcher and Larsen, in Jørgensen et al. (1958, Greenland, A. porsildii).
2n (10x) = 70. Urbanska-Worytkiewicz (1967, 1974, northern Norway, A. porsildii).
Ploidy levels recorded 8x, 9x, and 10x.
North American distribution. Nunavut Islands. Range in the Canadian Arctic Archipelago limited. Rare. Low Arctic. Arctic islands: Baffin (Cape Searle; no other information on the label).
Northern hemisphere distribution. Amphi-Atlantic. Northern Fennoscandian, Labrador Hudson Bay (?), West Greenland, East Greenland.
General notes. Section Alpinae.
Male plants are unknown and the taxon is most probably an agamospecies. It occurs frequently in western Greenland, is very scattered in northeastern Canada, and has a small area in the Canadian Rockies, which is an unusual distribution pattern. This entity is in many features intermediate between the A. alpina and A. monocephala groups and is here proposed treated with the former. It was accepted as a separate species by Scoggan (1979).
The analyses of Chmielewski (1998) supported the recognition of A. alpina subsp. canescens and subsp. porsildii as differing with respect to the degree, distribution, and type of pubescence of the basal leaves. In 2001, Elven examined a sheet from Nunavut, Baffin Island, Cape Searle (CAN 205051), identified as A. alpina subsp. porsildii by Chmielewski (1998) and considered it closer to the A. monocephala agg. He annotated the specimen as A. glabrata. Bayer (2006), in the treatment for Flora of North America, does not refer to Chmielewski's research and treats these two subspecies and A. media subsp. compacta in a broad concept of A. alpina.
Elven et al. (2003), commenting on Antennaria alpina (L.) Gaertn. subsp. porsildii (E. Ekman) Chmiel., stated, "A. glabrata may be problematic to include in subsp. porsildii. It is typified from western Greenland: Disco, 07–08. without year, leg. Vahl (C) lectotype, selected by Chmielewski (1998). The 'entity' is frequent in western Greenland, very scattered in northeast Canada and in a small area in the Canadian Rockies (omitted by Chmielewski). Male plants are unknown. It is in some features intermediate between the A. alpina and A. monocephala aggregates and fairly distinct from the main body of 'porsildii' s.s. in Greenland and Scandinavia. Its most evidently divergent features are as follows: one or very few and congested heads, narrow (non-spatulate) leaves, and lack of runners. The Baffin Island plants mapped....by Chmielewski (one collection in CAN) belong to this 'entity' and are generally more similar, in my [Elven's] opinion, to A. monocephala s.l. than to A. alpina s.l."
Illustrations. • Arctic Island Distribution.
This publication is available on the internet (posted May 2011) and on CD-ROM (published in 2007). These versions are identical in content, except that the errata page for CD-ROM is accessible on the main index page of the web version.
Recommended citation for the web-based version of this publication: Aiken, S.G., Dallwitz, M.J., Consaul, L.L., McJannet, C.L., Boles, R.L., Argus, G.W., Gillett, J.M., Scott, P.J., Elven, R., LeBlanc, M.C., Gillespie, L.J., Brysting, A.K., Solstad, H., and Harris, J.G. 2007. Flora of the Canadian Arctic Archipelago: Descriptions, Illustrations, Identification, and Information Retrieval. NRC Research Press, National Research Council of Canada, Ottawa. http://nature.ca/aaflora/data, accessed on DATE.
Recommended citation for the CD-ROM version of this publication: Aiken, S.G., Dallwitz, M.J., Consaul, L.L., McJannet, C.L., Boles, R.L., Argus, G.W., Gillett, J.M., Scott, P.J., Elven, R., LeBlanc, M.C., Gillespie, L.J., Brysting, A.K., Solstad, H., and Harris, J.G. 2007. Flora of the Canadian Arctic Archipelago: Descriptions, Illustrations, Identification, and Information Retrieval. [CD-ROM] NRC Research Press, National Research Council of Canada, Ottawa..