familyBetulaceae
subfamilyBetulaceae subfam. Betuloideae
genusBetula
speciesBetula nana
subspeciesBetula nana subsp. nana

Betula nana subsp. nana

John J. Furlow
Common names: Arctic dwarf birch
Treatment appears in FNA Volume 3.
Revision as of 07:40, 30 July 2020 by imported>Volume Importer
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)

Shrubs, procumbent, widely spreading, or upright, to 1 m. Bark dark-brown. Twigs sparsely to densely pubescent, dull, without heavy resinous coating, without large, warty, resinous glands. Leaf-blade broadly orbiculate or obovate-orbiculate to reniform, 0.8–1.5 × 0.8–2 cm, base rounded or cuneate to nearly cordate; surfaces abaxially sparsely pubescent to glabrous. Infructescences 0.5–1.5 × 0.4–1 cm; scales glabrous, lobes diverging distal to middle, ascending, about equal in length. 2n = 28.


Phenology: Flowering late spring.
Habitat: Tundra, open rocky barrens, and scrubs, in Europe subalpine mountain moors
Elevation: 0–600 m

Distribution

V3 763-distribution-map.gif

Greenland, N.W.T., n Europe

Discussion

Betula nana subsp. nana occurs in both eastern and western Greenland at latitudes north of 63 degrees. In Europe, the range of this subspecies extends across the subarctic zone and southward in the Alps and other ranges.

Selected References

None.

Lower Taxa

None.

"broadest" is not a number. "much narrower" is not a number.

... more about "Betula nana subsp. nana"
RDF feed
2n chromosome quantity
28 +
Anther architecture or structure in adjective form
2-locular +
Anther dehiscence
dehiscing +
Apex shape
rounded +
Author
John J. Furlow +
Authority
Linnaeus +
Bark architecture
tanniferous +  and furrowed +
Bark architecture or pubescence or relief
smooth +
Bark arrangement
close +
Bark coloration
dark-brown +
Bark condition or fragility
broken +
Bark relief
exfoliating +
Bark width
thin +
Base shape
cuneate +  and nearly cordate +
Bract architecture
foliaceous +
Bract quantity
2 +  and 3 +
Bract texture
woody +
Branch shape
terete +
Bud architecture
sessile +
Bud life cycle
young +
Bud quantity
2 (3) +
Bud season
winter +
Bud shape
terete +
Bud size
slender +
Catkin architecture
pistillate +
Catkin architecture or arrangement or growth form
solitary +  and in small racemose clusters +
Catkin inflorescence architecture
pistillate +
Catkin orientation
erect +
Catkin position
proximal +
Catkin position or structure subtype
terminal +
Catkin prominence
exposed +
Catkin quantity
3 (?) +
Catkin shape
ovoid +  and cylindric +
Catkin size
expanding +
Catkin texture
firm +
Common name
Arctic dwarf birch +
Cotyledon coating
oily +
Cotyledon prominence or shape
flat +
Cotyledon size or width
thickened +
Cupule architecture
multibracteate +
Distribution
Greenland +, N.W.T. +  and n Europe +
Elevation
0–600 m +
Embryo course
straight +
Endosperm presence
absent +
Endosperm width
thin +
Filament shape
divided +
Flower architecture
pistillate +  and staminate +
Flower arrangement
crowded +
Flower atypical quantity
1 (3) +
Flower quantity
3 +
Flower size
expanding +
Gland coating
resinous +
Gland pubescence or relief
warty +
Gland size
large +
Growth life cycle
new +
Habitat
Tundra, open rocky barrens, and scrubs, in Europe subalpine mountain moors +
Heavy coating
resinous +
Hull architecture
foliaceous +
Illustration copyright
Flora of North America Association +
Illustrator
John Myers +
Inflorescence reproduction
unisexual +
Infructescence length
0.5 cm5 mm <br />0.005 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
Infructescence orientation
erect +
Infructescence shape
cylindric +
Infructescence some measurement
1 cm10 mm <br />0.01 m <br /> (4 cm40 mm <br />0.04 m <br />) +
Infructescence width
0.4 cm4 mm <br />0.004 m <br /> (1 cm10 mm <br />0.01 m <br />) +
Integument quantity
1 +
Involucre architecture
leafy +
Lateral wing quantity
2 +
Lateral wing size
reduced +
Lateral wing texture
membranaceous +
Lateral wing width
Moderately wide (Broad) +
Leaf-blade architecture
veined +
Leaf-blade atypical length
10 cm100 mm <br />0.1 m <br /> (14 cm140 mm <br />0.14 m <br />) +
Leaf-blade length
0.8 cm8 mm <br />0.008 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
Leaf-blade shape
obovate-orbiculate;reniform +
Leaf-blade width
0.8cm;2cm +
Leaf architecture
simple +
Leaf arrangement
2-ranked +
Lenticel coloration
dark +
Lenticel presence
absent +
Lenticel prominence
inconspicuous +
Lenticel size
unexpanded +
Lobe length
Equal (?) +
Lobe orientation
ascending +
Lobe position
distal +  and middle +
Margin architecture or shape
serrate +
Margin shape
crenate +
Number of lower taxa
0 +
Nutlet architecture
1-seeded +
Ovary architecture or structure in adjective form
1-locular +  and 2-locular +
Ovary placentation
axile +
Ovary position
inferior +
Ovule orientation
pendulous +
Ovule quantity
1;2 +
Pair quantity
2 (6) +
Perianth prominence
not obvious +  and defined +
Perianth size
minute +
Perianth texture
membranaceous +
Pericarp texture
leathery +
Pericarp width
thin +
Petiole presence
absent +
Phenology
Flowering late spring. +
Pistil architecture
2(-3)-carpellate +
Pistil quantity
1 +
Pistillode presence
absent +
Pith shape
Triangular (?) +
Pollen-sac fusion
distinct +
Publication title
Sp. Pl. +
Publication year
1753 +
Reference
None +
Samara architecture
1-seeded +  and 2-winged +
Samara size
not extended +
Scale architecture or pubescence or relief
smooth +
Scale arrangement
crowded +  and imbricate +
Scale arrangement or dehiscence
valvate +
Scale duration
deciduous +
Scale pubescence
glabrous +
Scale quantity
several +
Scale shape
(1-)3-lobed +
Scale size
expanding +
Scale size or width
thickened +
Scale texture
not woody +  and leathery +
Season growth order
previous +
Seed-coat texture
membranous +
Sepal atypical quantity
4 (6) +
Sepal quantity
4 +
Sheet width
thicker +  and thin +
Short-shoot length or size
long +
Slit dehiscence or orientation
longitudinal +
Source xml
https://bibilujan@bitbucket.org/aafc-mbb/fna-fine-grained-xml.git/src/84153f6d59a0a91d69695978a64cee7560374f8e/V3/V3 763.xml +
Stamen atypical quantity
3 (4) +
Stamen quantity
2 +  and 3 +
Staminode presence
absent +
Stigma condition or texture
dry +
Stipule duration
deciduous +
Stipule fusion
distinct +
Style fusion
nearly +  and distinct +
Style quantity
2 +
Subtended architecture
2-3-flowered +
Subtended architecture or arrangement
compact +
Subtended arrangement
cluster +
Surface architecture
staminate +
Surface architecture or function or pubescence
resinous-glandular +
Surface pubescence
abaxially sparsely pubescent;glabrous +
Taxon family
Betulaceae +
Taxon name
Betula nana subsp. nana +
Taxon parent
Betula nana +
Taxon rank
subspecies +
Terminal bud presence
absent +
Trunk architecture
excurrent +  and branching +
Trunk architecture or texture
deliquescent +
Trunk quantity
several +
Trunk shape
terete +
Twig arrangement
2-ranked +
Twig life cycle
young +
Twig odor
Glabrous (Sparsely or moderately pubescent) +
Twig pubescence
pubescent +
Twig reflectance
dull +
Twig variability
differentiated +
Volume
Volume 3 +
Whole organism duration
deciduous +
Whole organism growth form
shrub +  and procumbent +
Whole organism growth form or orientation
sprawling +
Whole organism orientation
upright +  and spreading +
Whole organism some measurement
0m (1m) +
Wing width
much narrower +
Wood architecture
tanniferous +
Wood coloration
light +, nearly white +  and reddish-brown +
Wood pubescence or texture
soft +
Wood texture
soft +  and hard +
X chromosome quantity
14 +