Micranthes gaspensis

(Fernald) Small in N. L. Britton et al.

in N. L. Britton et al., N. Amer. Fl. 22: 552. 1918 ,.

Common names: Gaspé saxifrage saxifrage de Gaspésie
Basionym: Saxifraga gaspensis Fernald Rhodora 19: 141. 1917
Treatment appears in FNA Volume 8. Treatment on page 65. Mentioned on page 52.

Plants solitary or tufted, from caudex. Leaves basal; petiole flattened, 0.7–2.5 cm; blade obtrullate or obovate to ovate, 0.8–2.5 cm, ± coriaceous, base attenuate to ± cuneate, margins serrate to dentate on distal 2/3, ciliate, surfaces tangled, reddish brown-hairy abaxially, glabrous or glabrate adaxially. Inflorescences 3–10-flowered, subcapitate to spicate cymes or thyrses, 2–10 (–15) cm, glabrate to sparsely hairy proximally, ± densely purple-tipped stipitate-glandular distally. Flowers: sepals erect, reflexed in fruit, triangular to deltate; petals white, not spotted, obovate, clawed, 1.5–2 mm, ± equaling sepals; filaments linear, flattened; pistils connate to 1/2 their lengths; ovary 1/2 inferior, appearing more superior in fruit. Capsules green, becoming reddish or purplish, folliclelike. 2n = 40.


Phenology: Flowering summer.
Habitat: North- or west-facing, abrupt schist slopes, cliff bases, mossy or muddy areas, streamsides, seepages, cool ravines or chimneys
Elevation: 800-1100 m

Discussion

Of conservation concern.

Micranthes gaspensis appears to be the stabilized hybrid derivative of M. nivalis and M. tenuis (C. Gervais et al. 1995), known only from the Shickshock Mountains of the Gaspé Peninsula; the chromosome number is intermediate between that of the parents (2n = 60 and 20, respectively), and seeds are fertile. Neither parent occurs any longer in the Gaspé Peninsula, and the plants appear to self-perpetuate.

F1 hybrids of the two parent species (also 2n = 40) occur in Yukon (D. L. Krause and K. I. Beamish 1973) and possibly at other locations throughout their range of sympatry, such as northern Quebec and Labrador; such hybrids will key out with Micranthes gaspensis. Individuals called Saxifraga rufopilosa (Hultén) A. E. Porsild [S. nivalis (Linnaeus) Small var. rufopilosa Hultén] from Yukon and Alaska (W. J. Cody 2000) also will key out here. These may represent either the F1 hybrids mentioned above or stabilized hybrid populations such as those in the Gaspé. It is possible that such stabilized populations would fit under the name M. gaspensis. A systematic study is needed before a taxonomic conclusion can be reached concerning their status.

Selected References

None.

Lower Taxa

None.

"full" is not a number.

... more about "Micranthes gaspensis"
epigynous +, perigynous +  and hypogynous +
palmate +  and pinnate +
acute +  and obtuse or rounded +
Luc Brouillet +  and Patrick E. Elvander† +
(Fernald) Small in N. L. Britton et al. +
attenuate +  and more or less cuneate +
Saxifraga gaspensis +
dentate +, serrate +  and entire +
glandular-ciliate +  and ciliate +
obovate +  and ovate +
0.8 cm8 mm <br />0.008 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
coriaceous +
purplish;reddish;green +
3-carpellate +  and 2-carpellate +
connate +  and distinct +
Gaspé saxifrage +  and saxifrage de Gaspésie +
ebracteate +, bracteate +  and 2-300(-1000+)-flowered +
800-1100 m +
flattened +
bracteate +  and 2-70+[-1000]-flowered +
unisexual +  and bisexual +
2 cm20 mm <br />0.02 m <br /> (125 cm1,250 mm <br />1.25 m <br />) +
2-3(-4)-beaked +  and folliclelike +
North- or west-facing, abrupt schist slopes, cliff bases, mossy or muddy areas, streamsides, seepages, cool ravines or chimneys +
multicellular +
glabrous +, stipitate-glandular +  and hairy +
purplish +  and green +
free +  and adnate +
0 cm0 mm <br />0 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
purple-tipped +, subcapitate +  and spicate +
10 cm100 mm <br />0.1 m <br /> (15 cm150 mm <br />0.15 m <br />) +
stipitate-glandular;glabrate;sparsely hairy proximally +
2 cm20 mm <br />0.02 m <br /> (10 cm100 mm <br />0.1 m <br />) +
opposite +  and alternate +
crassinucellate +, unitegmic +  and bitegmic +
epigynous +, perigynous +  and hypogynous +
purple-margined +
not spotted +  and white +
reddish purple +  and purple +
distinct +
clawed +  and obovate +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
peltate +  and jointed +
flattened +
0.7 cm7 mm <br />0.007 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
Flowering summer. +
2(-3)-carpellate +
0 +  and 1/2 +
unequal +
in N. L. Britton et al., N. Amer. Fl. +
straight +
muricate +, cellular-rugulose +, tuberculate +, pitted +, papillate +  and wrinkled +
ovoid +, ellipsoid +  and oblong +
reddish +  and green +
distinct +
reflexed +  and erect +
triangular +  and deltate +
unbranched +  and branched +
persistent +
horizontal +  and erect +
2 +  and 3 +
connate +  and distinct +
reddish brown-hairy +
glabrate +  and glabrous +
Micranthes gaspensis +
Micranthes +
species +
dentate +, serrate +  and entire +
stoloniferous +  and rhizomatous +
tufted +  and solitary +
annual +, biennial +  and perennial +