Aruncus dioicus var. acuminatus

(Rydberg) H. Hara

J. Jap. Bot. 30: 68. 1955.

EndemicIllustrated
Basionym: Aruncus acuminatus Rydberg in N. L. Britton et al., N. Amer. Fl. 22: 255. 1908
Treatment appears in FNA Volume 9. Treatment on page 424. Mentioned on page 423.

Leaf surfaces mostly glabrous. Styles 0.3–0.5 mm. Follicles slender, 2.5–5 mm. Seeds 1.8–2.5 mm. 2n = 18.


Phenology: Flowering early summer.
Habitat: Moist to wet ravines, rocky ledges, avalanche tracks, stream banks, forest edges and openings
Elevation: 0–4800 m

Distribution

V9 716-distribution-map.jpg

Alta., B.C., Yukon, Alaska, Calif., Oreg., Wash.

Discussion

Selected References

None.

Lower Taxa

None.

"thick" is not a number.

T. Lawrence Mellichamp +
(Rydberg) H. Hara +
compound +  and simple +
opposite +  and alternate +
subcordate +  and attenuate +
Aruncus acuminatus +
reduced +
15 cm150 mm <br />0.15 m <br /> (60 cm600 mm <br />0.6 m <br />) +
thick +  and thin +
2-3-irregularly ternate +  and odd-pinnate +
Alta. +, B.C. +, Yukon +, Alaska +, Calif. +, Oreg. +  and Wash. +
not +  and aggregated +
0–4800 m +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
retrorse +  and inverted +
ovate-elongate +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
not +  and aggregated +
not +  and aggregated +
Moist to wet ravines, rocky ledges, avalanche tracks, stream banks, forest edges and openings +
rhizomatous +, glandular +, multicellular +  and simple +
straight +  and curved +
glabrous or +  and sparsely densely hairy +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
500-2500-flowered +
crassinucellate +
compound +  and simple +
deciduous +
long-petiolulate +
green +  and gray-green +
broadly ovate +  and narrowly lanceolate +
6 cm60 mm <br />0.06 m <br /> (15 cm150 mm <br />0.15 m <br />) +
entire +, pinnate +  and serrate +
toothed +, unlobed +  and lobed +
inferior +  and superior +
biseriate +  and clustered +
collateral +  and apical +
2 +  and 4 +
0 (?) +  and 4 (?) +
free +  and distinct +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
Flowering early summer. +
adnate +, free +, connate +  and distinct +
J. Jap. Bot. +
not arillate +
0.2 cm2 mm <br />0.002 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
caudate;elongate +
1.8mm +  and 2.5mm +
membranous +
persistent +
free +  and distinct +
spreading +  and appressed +
triangular +
1 cm10 mm <br />0.01 m <br /> (?) +
Endemic +  and Illustrated +
free +  and distinct +
rudimentary +
1.5mm +  and 2mm +
1 +  and 5 +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.03 cm0.3 mm <br />3.0e-4 m <br />) +
persistent +
distinct +
basal +, lateral +, subterminal +  and terminal +
not elongate +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
Aruncus dioicus var. acuminatus +
Aruncus dioicus +
variety +
inconspicuous +
pistillate +  and staminate +
herb +  and clump-forming +