Clematis addisonii

Britton

Mem. Torrey Bot. Club 2: 28. 1890.

Common names: Addison's virgin's-bower Addison Brown's clematis Addison's leather-flower Addison Brown's leather-flower
Conservation concernEndemic
Synonyms: Viorna addisonii (Britton) Small
Treatment appears in FNA Volume 3.

Stems usually ascending to erect, occasionally somewhat viny, 0.6-1 m, glabrous. Leaves all simple, blade often 1-pinnate on distal and middle leaves on vigorous plants 4-13 × 2-9.5 cm; leaflets 2-6 plus additional tendril-like terminal leaflet, ovate, unlobed, 1.5-6 × 1-4.5 cm, not prominently reticulate; surfaces abaxially glabrous and glaucous. Inflorescences terminal and axillary, flowers solitary. Flowers ovoid to broadly urn-shaped; sepals purple or reddish purple, whitish toward tips, ovatelanceolate, 1.2-2.5 cm, margins not expanded, thick, not crispate, tomentose, tips acute, spreading, abaxially glabrous. Achenes: bodies puberulent; beak 2.5-3.5 cm, plumose. 2n = 16.


Phenology: Flowering spring–early summer.
Habitat: Calcareous, dry woods, glades, rock outcrops
Elevation: 200-600 m

Discussion

Of conservation concern.

Clematis addisonii is known only from Botetourt, Montgomery, Roanoke, and Rockbridge counties in western Virginia. Reports of this infrequent species from other southeastern states have been based on misidentified specimens (W. M. Dennis 1976).

Selected References

None.

Lower Taxa

None.

"thick" is not a number.

... more about "Clematis addisonii"
flattened +
James S. Pringle +
Britton +
cuneate +, truncate +  and cordate +
Undefined subg. Viorna +
curved +  and straight +
variable +
plumose +
2.5 cm25 mm <br />0.025 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
puberulent +
scale-like;leaflike +
globose;cylindric +
Addison's virgin's-bower +, Addison Brown's clematis +, Addison's leather-flower +  and Addison Brown's leather-flower +
bracteate +  and 3-7-flowered +
paired +  and solitary +
0 cm0 mm <br />0 m <br /> (15 cm150 mm <br />0.15 m <br />) +
200-600 m +
filiform +  and flattened +
bracteate +  and 3-7-flowered +
paired +  and solitary +
showy +  and inconspicuous +
0 cm0 mm <br />0 m <br /> (15 cm150 mm <br />0.15 m <br />) +
sessile +  and aggregate +
flattened-ellipsoid;terete;flattened-ellipsoid;terete;lenticular +
Calcareous, dry woods, glades, rock outcrops +
2-pinnate +  and 1-pinnate +
cordate +  and orbiculate oblong lanceolate or oblanceolate lobed or unlobed +
1.5 cm15 mm <br />0.015 m <br /> (6 cm60 mm <br />0.06 m <br />) +
unlobed +  and ovate +
1 cm10 mm <br />0.01 m <br /> (4.5 cm45 mm <br />0.045 m <br />) +
palmate +  and pinnate +
not crispate +
not expanded +
1-many-flowered +
0 cm0 mm <br />0 m <br /> (15 cm150 mm <br />0.15 m <br />) +
distinct +
conspicuous +
reduced +
Flowering spring–early summer. +
5 +  and 150 +
4 cm40 mm <br />0.04 m <br /> (13 cm130 mm <br />0.13 m <br />) +
2 cm20 mm <br />0.02 m <br /> (9.5 cm95 mm <br />0.095 m <br />) +
Mem. Torrey Bot. Club +
not arillate +  and stalked +
whitish;reddish purple +
not persistent +
distinct +
abaxially glabrous +  and silky hirsute or tomentose +
3 +  and 6 +
ovatelanceolate +
1.2 cm12 mm <br />0.012 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
Conservation concern +  and Endemic +
usually ascending +  and erect +
60 cm600 mm <br />0.6 m <br /> (100 cm1,000 mm <br />1 m <br />) +
persistent +
glaucous;glabrous +
Viorna addisonii +
Clematis addisonii +
Clematis subg. Viorna +
species +
annual +  and perennial +