Maianthemum dilatatum

(Alph. Wood) A. Nelson & J. F. Macbride

Bot. Gaz. 61: 30. 1916.

Common names: May-lily false lily-of-the-valley
Basionym: Maianthemum bifolium var. dilatatum Alph. Wood Proc. Acad. Nat. Sci. Philadelphia 20: 174. 1868 (as Majanthemum)
Synonyms: Maianthemum bifolium var. kamtschaticum (J. F. Gmelin) Jepson Maianthemum kamtschaticum (Alph. Wood) Greene Unifolium dilatatum (J. F. Gmelin) Gorman Unifolium kamtschaticum
Treatment appears in FNA Volume 26. Treatment on page 208. Mentioned on page 207.

Plants terrestrial, 20–45 cm. Rhizomes sympodial, proliferatively branching, units 8–20 cm × 1–1.5 mm, roots restricted to nodes. Stems erect, 1.5–3.5 dm × 2–4 mm. Leaves solitary on sterile shoots, 2–3 on fertile shoots, petiolate; blade cordate, 6–10 × 5–8 cm; base lobed, with deep sinus; apex sharply acute; proximal leaves short-petiolate, blade triangular to cordate, petiole 4–7 cm; distal leaves petiolate, blade deeply cordate, petiole 7–10 cm. Inflorescences racemose, complex, 15–40-flowered. Flowers (1–)3(–4) per node, 2-merous; tepals conspicuous, 2–3.2 × 1.5 mm; filaments 1.5 mm; anthers 0.2–0.4 mm; ovary globose, 0.8–1 mm wide; style 0.4–0.5 mm; stigma distinctly 2-lobed; pedicel 3–5 × 0.2–0.4 mm. Berries green mottled with red when young, maturing to deep translucent red, globose, 4–6 mm diam. Seeds 1–2, globose, 2–3 mm. 2n = 36.

Phenology: Flowering early spring.
Habitat: Abundant in coniferous and deciduous forests, especially in forest margins
Elevation: 0–800 m


V26 357-distribution-map.jpg

B.C., Yukon, Alaska, Calif., Idaho, Oreg., Wash., Asia (Kamtchatka peninsula in e Russia to Japan).


Variation in the gross morphology, karyology, and ecology of the North American populations has been documented (S. Kawano et al. 1971) and compared with that of disjunct populations in Japan (S. Kawano et al. 1968b).

Selected References


Lower Taxa

... more about "Maianthemum dilatatum"
James V. LaFrankie +
(Alph. Wood) A. Nelson & J. F. Macbride +
Maianthemum bifolium var. dilatatum +
May-lily +  and false lily-of-the-valley +
B.C. +, Yukon +, Alaska +, Calif. +, Idaho +, Oreg. +, Wash. +  and Asia (Kamtchatka peninsula in e Russia to Japan). +
0–800 m +
Abundant in coniferous and deciduous forests, especially in forest margins +
Flowering early spring. +
Maianthemum bifolium var. kamtschaticum +, Maianthemum kamtschaticum +, Unifolium dilatatum +  and Unifolium kamtschaticum +
Maianthemum dilatatum +
Maianthemum +
species +