Flora of the Canadian Arctic Archipelago

DELTA
Home

S.G. Aiken, M.J. Dallwitz, L.L. Consaul, C.L. McJannet, R.L. Boles, G.W. Argus, J.M. Gillett, P.J. Scott, R. Elven, M.C. LeBlanc, L.J. Gillespie, A.K. Brysting, H. Solstad, and J.G. Harris

Plumbaginaceae A.L. de Jussieu

English: Leadwort family.

Plumbaginaceae, Leadwort family.

Vegetative morphology. Plants 5–20(–30) cm high; perennial herbs; caespitose. Taproot present. Ground level or underground stems absent. Caudex present. Aerial stems erect. Leaves mainly basal; alternate; persistent. Petioles absent. Ligules absent (although the leaves are grass-like). Leaf blades simple. Leaves grass-like. Blades 50–100 mm long, 1–1.5(–2.5) mm wide (wider at the sheathing base), appressed to the stem or spreading, linear, flat or involute (slightly), with inconspicuous veins. Blade adaxial surface glabrous. Blade abaxial surface glabrous. Blade margins glabrous or with non-glandular hairs (sparse and probably glabrescent); apices acuminate.

Reproductive morphology. Flowering stems conspicuously taller than the leaves; without leaves. Inflorescences cymose, or head-like; dense; globose or sub-globose; 1–2 cm long; 1.5–2.5 mm wide. Pedicels absent. Involucral bracts present. Number of rows 2. Outer involucral bracts mostly green; obovate; 4.5–5.5 mm high; 3–4 mm wide; glabrous. Flowers per inflorescence 30–50; medium-sized, or large. Sepals conventional; 5; fused; 3–4 mm wide (at anthesis); green, or white; herbaceous (in flower), or scarious (in fruit); accrescent (becoming like a badminton shuttle-cock and assisting seed dispersal). Calyx funnel-form; 5-lobed. Petals conventional; free; longer than the calyx (at anthesis); 5; red, or pink; spatulate; unlobed, or slightly lobed or undulating; 7–9 mm long; 3–3.5 mm wide. Stamens 5; stamen filaments glabrous; fused to the corolla (at the base). Anthers ellipsoid; 1–1.5 mm long. Ovary superior; carpels 5; syncarpous. Ovaries sub-globose; glabrous. Styles 5; 4.5–5.5 mm long. Stigmas per ovary 1. Placentation basal. Ovules per ovary 1. Fruit sessile; with calyx persisting; dry; a nut; ovoid; brown; 1–1.2 mm long; 0.4–0.6 mm wide (rare in Arctic samples); not distinctly flattened; indehiscent. Seeds 1.


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.

.

Contents