Aruncus dioicus var. pubescens

(Rydberg) Fernald

Rhodora 41: 423. 1939.

Endemic
Basionym: Aruncus pubescens Rydberg in N. L. Britton et al., N. Amer. Fl. 22: 256. 1908
Treatment appears in FNA Volume 9. Treatment on page 424. Mentioned on page 423.

Leaf surfaces densely hairy. Styles 0.3–0.8 mm. Follicles slender, 1.6–2.4 mm. Seeds 1.5–2 mm. 2n = 18.


Phenology: Flowering early summer.
Habitat: Rich woods, limestone bluffs
Elevation: 50–700 m

Distribution

V9 715-distribution-map.jpg

Ark., Ill., Ind., Iowa, Ky., Miss., Mo., Ohio, Okla., Tenn.

Discussion

Variety dioicus gradually gives way to var. pubescens, which has more consistently thicker and hairier leaves and occurs west of the Appalachian Mountains; there is variation in indument throughout the eastern range of var. dioicus.

Selected References

None.

Lower Taxa

None.

"thick" is not a number.

T. Lawrence Mellichamp +
(Rydberg) Fernald +
compound +  and simple +
opposite +  and alternate +
subcordate +  and attenuate +
Aruncus pubescens +
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 +
Ark. +, Ill. +, Ind. +, Iowa +, Ky. +, Miss. +, Mo. +, Ohio +, Okla. +  and Tenn. +
not +  and aggregated +
50–700 m +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
0.16 cm1.6 mm <br />0.0016 m <br /> (0.24 cm2.4 mm <br />0.0024 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 +
Rich woods, limestone bluffs +
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 +
not arillate +
0.2 cm2 mm <br />0.002 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
caudate;elongate +
1.5mm +  and 2mm +
membranous +
persistent +
free +  and distinct +
spreading +  and appressed +
triangular +
1 cm10 mm <br />0.01 m <br /> (?) +
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 /> (0.08 cm0.8 mm <br />8.0e-4 m <br />) +
Aruncus dioicus var. pubescens +
Aruncus dioicus +
variety +
inconspicuous +
pistillate +  and staminate +
herb +  and clump-forming +