Dryas incisa

Juzepczuk

Izv. Glavn. Bot. Sada S.S.S.R. 28: 312, 323. 1929.

Treatment appears in FNA Volume 9. Treatment on page 328. Mentioned on page 329.

Plants 1–9.5 cm. Leaf-blades oblongelliptic to lanceolate, 4–16 (–25) × 1–6 (–10) mm, base usually cuneate, sometimes truncate or cordate, margins strongly revolute to entire, usually serrate or crenate, sometimes dentate, sinuses 5–30% to midvein, apex acute to slightly obtuse, surfaces smooth to rugulose, only midvein ± obscured adaxially within medial fold, abaxial tomentose (obscuring lateral-veins), adaxial usually glabrous, sometimes tomentose, feathery hairs usually absent, rarely 1–3 on midveins abaxially, midveins and petioles abaxially not stipitate-glandular, sessile glands usually present, rarely absent, longer hairs on adaxial surface and petioles sparse. Peduncles 17–150 mm. Flowers erect at flowering; sepals lanceolate to narrowly elliptic, 4–8 × 0.7–2.5 mm; petals 8, spreading, usually white or cream, sometimes yellow, 9–14 × 5–11 mm; filaments glabrous. Achenes 2.2–3.5 mm; styles 11–25 mm. 2n = 18 (Siberia).


Phenology: Flowering Jun–Aug.
Habitat: Alpine rocky limestone slopes, heath meadows, dry gravel, mesic tundra meadows, outwash plains
Elevation: 0–1800 m

Distribution

V9 536-distribution-map.jpg

N.W.T., Yukon, Alaska, Asia (Russian Far East), Asia (Siberia)

Discussion

Occasional plants without feathery hairs identified as Dryas ajanensis subsp. beringensis are likely D. incisa.

Dryas crenulata Juzepczuk and D. integrifolia subsp. crenulata (Juzepczuk) Scoggan have been misapplied to D. incisa, for example, by A. E. Porsild and W. J. Cody (1980) and Cody (2000). Dryas crenulata is of eastern Siberia (B. A. Jurtzev 1984).

Selected References

None.

Lower Taxa

None.
... more about "Dryas incisa"
woolly +  and tomentose +
2.2mm +  and 3.5mm +
tomentose +  and glabrous +
tomentose +  and glabrous +
Joshua C. Springer +  and Bruce D. Parfitt† +
Juzepczuk +
blackish +, reddish +  and brown +
compound +  and simple +
opposite +  and alternate +
cordate +, truncate +  and cuneate +
3.9 cm39 mm <br />0.039 m <br /> (4.6 cm46 mm <br />0.046 m <br />) +
smooth +  and rugose +
ovate +, oval +, obovate +, oblongelliptic +, oblong +, linear +, lanceolate +  and elliptic +
0.2 cm2 mm <br />0.002 m <br /> (3.9 cm39 mm <br />0.039 m <br />) +
stoloniferous +
free +  and distinct +
N.W.T. +, Yukon +, Alaska +, Asia (Russian Far East) +  and Asia (Siberia) +
not +  and aggregated +
0–1800 m +
stipitate-glandular +  and villous +
1.3 cm13 mm <br />0.013 m <br /> (2.9 cm29 mm <br />0.029 m <br />) +
unisexual +  and bisexual +
not +  and aggregated +
linear +  and lanceolate +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
Alpine rocky limestone slopes, heath meadows, dry gravel, mesic tundra meadows, outwash plains +
1 +  and 3 +
0.3 cm3 mm <br />0.003 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
crassinucellate +
1.6 cm16 mm <br />0.016 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
0.6 cm6 mm <br />0.006 m <br /> (1 cm10 mm <br />0.01 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (1.6 cm16 mm <br />0.016 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
persistent +
crenate +, serrate +  and revolute to entire +
stipitate-glandular +
inferior +  and superior +
clustered +, biseriate +  and superposed +
1.7 cm17 mm <br />0.017 m <br /> (15 cm150 mm <br />0.15 m <br />) +
Yellow (?) +, Cream (?) +  and White (?) +
persistent +  and deciduous +
free +  and distinct +
0.9 cm9 mm <br />0.009 m <br /> (1.4 cm14 mm <br />0.014 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (1.1 cm11 mm <br />0.011 m <br />) +
stipitate-glandular +  and tomentose +
Flowering Jun–Aug. +
adnate +, free +, connate +  and distinct +
Izv. Glavn. Bot. Sada S.S.S.R. +
not arillate +
persistent +
free +  and distinct +
erect-ascending +, ascending +  and spreading +
lanceolate +  and narrowly elliptic +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
free +  and distinct +
rooting +  and branched +
adnate +  and free +
persistent +
distinct +
basal +, lateral +, subterminal +  and terminal +
elongate +
1.1 cm11 mm <br />0.011 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
smooth +  and rugulose +
Dryas incisa +
species +
inconspicuous +
hemispheric +