Aconogonon alaskanum
Alaska wild-rhubarb
erect, glabrous or densely and retrorsely pubescent.
ocrea reddish brown, funnelform, 1–2.2 cm, margins oblique, glabrous or pilose;
petiole 0.8–3.5(–4) mm;
blade narrowly lanceolate to ovate, 5–20 × 2–8 cm, not subcoriaceous, base truncate or obtuse to subcordate, margins sometimes irregularly undulate, ciliate or, rarely, glabrous, apex acuminate, faces not glaucous, glabrous or pubescent.
terminal, sometimes also axillary, paniclelike;
peduncle 0–4 cm, glabrous or pubescent.
0.5–0.1 mm.
2–4 per ocreate fascicle, all flowers with stamens well developed;
perianth white or greenish white, 2–4 mm;
tepals dimorphic, rarely slightly so, ovate, apex obtuse;
anthers yellow to pink.
included or exserted, tan to grayish brown, not beaked distally, 2.6–3.8 × 2–3 mm, shiny, faces usually not concave.
= 20.
Aconogonon alaskanum
Varieties 2 (2 in the flora).
Aconogonon alaskanum has been considered conspecific with the morphologically similar Eurasian A. alpinum (Allioni) Schur, but the taxa differ in leaf size and achene characters. Nomenclatural issues were clarified by J. T. Kartesz and K. N. Gandhi (1990) and K. L. Chambers (1992).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
1. Leaf blades pubescent; stems usually densely and retrorsely pubescent | var. alaskanum |
1. Leaf blades glabrous except for margins; stems mostly glabrous, rarely pubescent proximal to nodes | var. glabrescens |
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