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

Distribution

V26 357-distribution-map.jpg

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

Discussion

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

None.

Lower Taxa

None.

"thicker" is not a number."dm" is not declared as a valid unit of measurement for this property.

... more about "Maianthemum dilatatum"
versatile +  and dorsifixed +
cordate +  and linear +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.04 cm0.4 mm <br />4.0e-4 m <br />) +
James V. LaFrankie +
(Alph. Wood) A. Nelson & J. F. Macbride +
whorled +, opposite +  and alternate +
Maianthemum bifolium var. dilatatum +
translucent red +  and green mottled with red +
0.4 cm4 mm <br />0.004 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
globose +
reticulate-veined +  and parallel-veined +
6 cm60 mm <br />0.06 m <br /> (10 cm100 mm <br />0.1 m <br />) +
pubescent +  and glabrous +
cordate +  and triangular +
5 cm50 mm <br />0.05 m <br /> (8 cm80 mm <br />0.08 m <br />) +
sheathing +  and involucrate +
1;several +
tunicate +  and scaly +
short-petiolate +  and clasping +
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 +
connate-coroniform +  and dilated +
1.5 cm15 mm <br />0.015 m <br /> (?) +
unisexual +  and bisexual +
bright red;mottled +
indehiscent +, septicidal +  and loculicidal +
membranaceous +  and leathery +
0.4 cm4 mm <br />0.004 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
Abundant in coniferous and deciduous forests, especially in forest margins +
15-40-flowered +  and complex +
persistent +
entire +, denticulate +, undulate +  and flat +
2-3-carpellate +
globose +
0.8mm;1mm +
many;several +
0.3 cm3 mm <br />0.003 m <br /> (?) +  and 0.5 cm5 mm <br />0.005 m <br /> (?) +
0.2mm;0.4mm +
zygomorphic +  and actinomorphic +
7 cm70 mm <br />0.07 m <br /> (10 cm100 mm <br />0.1 m <br />) +
Flowering early spring. +
branching +  and sympodial +
cylindrical +  and filiform +
wind-distributed +
1 +  and 2 +
globose +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
fertile +  and sterile +
adnate +  and free +
staminodial +
3 +, 4 +  and 6 +
2mm;4mm +
1 +  and several +
0 cm0 mm <br />0 m <br /> (?) +  and 0.1 cm1 mm <br />0.001 m <br /> (?) +
3 +  and 1 +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
Maianthemum bifolium var. kamtschaticum +, Maianthemum kamtschaticum +, Unifolium dilatatum +  and Unifolium kamtschaticum +
Maianthemum dilatatum +
Maianthemum +
species +
distinct +
2mm;3.2mm +
conspicuous +
triangular +  and ovate +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
sepaloid +  and petaloid +
narrower +
8 cm80 mm <br />0.08 m <br /> (20 cm200 mm <br />0.2 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
caulescent +  and scapose +
3 +  and 2 +