Cypripedium yatabeanum

Makino

Bot. Mag. (Tokyo) 13: 91. 1899.

Synonyms: Cypripedium guttatum subsp. yatabeanum (Makino) Hultén Cypripedium guttatum var. yatabeanum (Makino) Pfitzer
Treatment appears in FNA Volume 26. Treatment on page 500.

Plants erect, 17–32 cm. Leaves 2 (–3, very rarely), on middle half of stem, alternate to subopposite, widespreading; blade elliptic-lanceolate to lanceovate or ovate-suborbiculate, 6–12 × 3–7 cm. Flowers solitary; sepals white to yellowish or greenish with brownish or tan markings; dorsal sepal obovate to ovate, 15–23 × 9–18 mm; petals spreading, same color as sepals, acuminate-subpandurate to acuminate-pandurate (constricted near middle), flat, 10–14 × 5–8 mm, much shorter than lip, margins undulate-revolute; lip similarly colored, oblance-fusiform to oblance-ovoid, 17–32 mm; orifice basal, 10–22 mm; staminode oblong-quadrangular to broadly ellipsoid or ovoid. 2n = 20.


Phenology: Flowering Jun–Aug.
Habitat: Mesic tundra, swales, marsh borders, beach dune lags
Elevation: mostly 0–200 m

Distribution

V26 1022-distribution-map.jpg

Alaska, Asia (n Japan), Asia (Kamchatka)

Discussion

Cypripedium yatabeanum is known from only a few collections in North America and hence the description may be too restrictive. From the much more common and widespread C. guttatum, it is distinguished by flowers with pale brown markings and a markedly narrow aspect, with comparatively narrow lip, short, often pandurate petals constricted toward the middle, and narrower dorsal sepals commonly broadest toward the apex. Asiatic plants are sometimes considerably larger than those of C. guttatum, and robust Japanese plants sometimes bear three leaves. Plants typical of Asiatic C. yatabeanum occur on some of the Aleutian Islands, while on other islands, plants with brownish markings appear morphologically intermediate between these taxa, or more typical of C. guttatum. Elsewhere in southern Alaska, populations of typical C. guttatum support some plants with pale brownish pink markings. This situation has suggested to some that these taxa were only infraspecifically distinct. The distribution of the intermediate plants, however, suggests that geographically limited introgression during an earlier, more extensive presence of C. yatabeanum is an appropriate interpretation. Evident introgressants have been named C. ×alaskanum P. M. Brown, and most reports and illustrations of C. yatabeanum in Alaska are in fact based on them.

Selected References

None.

Lower Taxa

None.

... more about "Cypripedium yatabeanum"
self-pollination +
Charles J. Sheviak +
Makino +
indehiscent +
not +  and articulate +
conduplicate +  and plicate +
6 cm60 mm <br />0.06 m <br /> (12 cm120 mm <br />0.12 m <br />) +
elliptic-lanceolate +  and lanceovate or ovate-suborbiculate +
3cm;7cm +
Alaska +, Asia (n Japan) +  and Asia (Kamchatka) +
1.5 cm15 mm <br />0.015 m <br /> (2.3 cm23 mm <br />0.023 m <br />) +
0.9 cm9 mm <br />0.009 m <br /> (1.8 cm18 mm <br />0.018 m <br />) +
mostly 0–200 m +
3-merous +, sessile +  and pedicellate +
ellipsoid;oblong-ellipsoid +
Mesic tundra, swales, marsh borders, beach dune lags +
lateral +  and terminal +
petiolate +, sessile +  and simple +
alternate +  and subopposite +
cauline +  and basal +
reduced +
oblance-fusiform +  and oblance-ovoid +
larger +
1.7 cm17 mm <br />0.017 m <br /> (3.2 cm32 mm <br />0.032 m <br />) +
undulate-revolute +
tan +  and brownish +
differing in form and color +
1 cm10 mm <br />0.01 m <br /> (2.2 cm22 mm <br />0.022 m <br />) +
1-many-flowered +  and cymose +
pendent +  and erect +
1 cm10 mm <br />0.01 m <br /> (1.4 cm14 mm <br />0.014 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
Flowering Jun–Aug. +
Bot. Mag. (Tokyo) +
short;elongate +
aerial +  and subterranean +
slender +
minute +
white +  and yellowish or greenish +
distinct +
foliaceous +
not +  and alike +
oblong-quadrangular +  and broadly ellipsoid or ovoid +
scapose +  and leafy +
pendent +  and erect +
proliferous +
thickened +  and stout +
2-3-lobed +
Cypripedium guttatum subsp. yatabeanum +  and Cypripedium guttatum var. yatabeanum +
Cypripedium yatabeanum +
Cypripedium +
species +
aquatic +, lithophytic +, terrestrial +  and epiphytic +
saprophytic +, photosynthetic +  and mycotrophic +