Geum radiatum

Michaux

Fl. Bor.-Amer. 1: 300. 1803.

Common names: Appalachian or spreading avens
Conservation concernEndemic
Synonyms: Sieversia radiata (Michaux) G. Don
Treatment appears in FNA Volume 9. Treatment on page 64. Mentioned on page 60, 65.

Plants subscapose. Stems 10–45 (–60) cm, densely hirsute proximally to puberulent distally. Leaves: basal 10–30 cm, blade strongly lyrate-pinnate, sometimes simple, major leaflet 1, minor leaflets 1–6, terminal leaflet much larger than minor laterals; cauline 1.2–4 cm, stipules not evident, blade bractlike, not resembling basal, simple. Inflorescences 3–10-flowered. Pedicels glandular-hairy. Flowers erect; epicalyx bractlets 2–5 mm; hypanthium green; sepals spreading in flower, erect in fruit, 6–10 mm; petals spreading, yellow, orbiculate to obcordate, 9–16 mm, longer than sepals, apex emarginate. Fruiting tori sessile, glabrous. Fruiting styles wholly persistent, not geniculate-jointed, 8–12 mm, apex not hooked, pilose and stipitate-glandular in basal 1/3.2n = 42.


Phenology: Flowering summer.
Habitat: Rocky cliffs and ledges, montane balds
Elevation: 1500–1900 m

Discussion

Of conservation concern.

Geum radiatum is closely related to G. calthifolium and G. peckii. The morphologic differences among them are slight compared to the discontinuities separating other Geum species. On the basis of morphology it would be possible to combine all three in a single species. Yet they occupy distinct ranges separated by a minimum of 1200 km. Traditionally, they have been treated as separate species, and recently I. G. Paterson and M. Snyder (1999) reported molecular genetic evidence for continuing to recognize G. peckii and G. radiatum as separate species.

Geum radiatum is listed as an endangered species by the U.S. Fish and Wildlife Service.

Selected References

None.

Lower Taxa

None.
... more about "Geum radiatum"
stipitate-glandular +, pilose +  and glabrous +
Joseph R. Rohrer +
Michaux +
compound +  and simple +
opposite +  and alternate +
10 cm100 mm <br />0.1 m <br /> (30 cm300 mm <br />0.3 m <br />) +
not simple +  and simple +
bractlike +
free +  and distinct +
1.2 cm12 mm <br />0.012 m <br /> (4 cm40 mm <br />0.04 m <br />) +
Appalachian or spreading avens +
N.C. +  and Tenn. +
not +  and aggregated +
1500–1900 m +
0.2 cm2 mm <br />0.002 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (4.6 cm46 mm <br />0.046 m <br />) +
unisexual +  and bisexual +
not +  and aggregated +
tapered +, ovoid +  and fusiform +
0.2 cm2 mm <br />0.002 m <br /> (0.45 cm4.5 mm <br />0.0045 m <br />) +
Rocky cliffs and ledges, montane balds +
0.2 cm2 mm <br />0.002 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
crassinucellate +
odd-pinnate +, lyrate-pinnate +, 3-foliolate +  and simple +
opposite +  and alternate +
winter-persistent +
cauline +  and basal +
cordate +, reniform +, orbiculate +, oblanceolate +, obovate +, oblong +, elliptic +  and rhombic +
palmate +  and pinnate +
crenate +, dentate +, laciniate +, 2-7-lobed +, flat +, lobed +, toothed +  and entire +
inferior +  and superior +
clustered +, biseriate +  and superposed +
glandular-hairy +
purple-veined +
0 (?) +  and 4 (?) +
free +  and distinct +
0.9 cm9 mm <br />0.009 m <br /> (1.6 cm16 mm <br />0.016 m <br />) +
Flowering summer. +
adnate +, free +, connate +  and distinct +
Fl. Bor.-Amer. +
not arillate +
persistent +
free +  and distinct +
erect +  and spreading +
deltate-lanceolate +, deltate-ovate +  and deltate +
0.6 cm6 mm <br />0.006 m <br /> (1 cm10 mm <br />0.01 m <br />) +
Conservation concern +  and Endemic +
free +  and distinct +
1 +  and 5 +
10 cm100 mm <br />0.1 m <br /> (45 cm450 mm <br />0.45 m <br />) +
palmate +  and pinnate +
adnate +  and free +
geniculate-jointed +  and entire +
persistent +
distinct +
elongating +
basal +, lateral +, subterminal +  and terminal +
hairy +  and glabrous +
not hooked +  and hooked +
accrescent +
10 cm100 mm <br />0.1 m <br /> (?) +
Sieversia radiata +
Geum radiatum +
species +
inconspicuous +
hemispheric +  and cylindric +
enlarged +
not geniculate-jointed +
0.8 cm8 mm <br />0.008 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
hairy +  and glabrous +