Monographs Details: Helianthemum bicknellii Fernald
Authority: Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
Family:Cistaceae
Description:Species Description - Stems ± clustered on a loosely branched caudex, mostly 2–5 dm, at first anthesis simple or nearly so and with a terminal infl of (2–)6–10(–18) open, petaliferous fls, later with numerous erect or appressed branches and branchlets bearing axillary glomerules of cleistogamous fls, but these later branches not much if at all overtopping the main axis; lvs linear-oblong to narrowly elliptic, cuneate at base, stellate-pubescent (more densely so beneath), without longer hairs, those of the main axis 2–3 cm, the others smaller; cal of open fls 5–7 mm, stellate-pubescent, without longer hairs, the outer sep nearly as long as the inner; pet 8–12 mm; outer sep of cleistogamous fls with an evident, linear free tip 0.5–1+ mm, fr of open fls 3.5–5 mm, with 12–26 seeds, of cleistogamous fls 1.5–2 mm, with 1–2(3) seeds; seeds indistinctly reticulate. Dry, usually sandy soil; Me. to Minn. and s. Man., s. to n. Ga., Ark., and Colo. June–July, 2–3 weeks later than no. 1 [Helianthemum canadense (L.) Michx.]. (H. majus and Crocanthemum majus, misapplied; C. bicknellii)