Helianthemum canadense (L.) Michx.

  • Authority

    Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.

  • Family


  • Scientific Name

    Helianthemum canadense (L.) Michx.

  • Description

    Species Description - Stems ± clustered and ± erect, at first anthesis simple or nearly so and mostly 1.5–3 dm, with a single (2) terminal open fl, later much-branched, to 3–6 dm, with strongly ascending branches and branchlets overtopping the main axis and bearing small terminal and axillary glomerules of small, cleistogamous fls; lvs of the main stem mostly 2–3(–4) cm × 5–8 mm, elliptic-oblanceolate or narrowly elliptic, the lower side densely stellate-tomentose, the upper greener, its shining surface visible through the sparse covering of mixed stellate and longer (1 mm) simple hairs, but these lvs deciduous, and those of the branches smaller and with fewer or no long hairs; cal of open fls 6–9 mm, with evident long, simple hairs as well as smaller stellate ones, the outer sep well developed, more than half as long as the inner; pet 8–15 mm; cal of cleistogamous fls merely stellate, the outer sep largely adnate to the inner, with a tiny free point; fr of open fls 6–7 mm, with 30–45 seeds, of cleistogamous fls 2–3 mm, with 5–10 seeds; seeds papillate; 2n=20. Dry, sandy soil or upland woods; Me. and N.S. to Minn., s. to Ga., Tenn., and Mo. Late May–June. (Crocanthemum c.; H. majus)