Geum schofieldii

Calder & Roy L. Taylor

Canad. J. Bot. 43: 1394. 1965.

Common names: Queen Charlotte avens
Conservation concernEndemic
Treatment appears in FNA Volume 9. Treatment on page 63. Mentioned on page 60, 64.

Plants subscapose. Stems 13–30 cm, puberulent, hairs scattered, 0.1–1 mm. Leaves: basal 5–25 cm, blade interruptedly lyrate-pinnate, major leaflets 5–7, interspersed with 2–8 minor ones increasing in size distally, terminal leaflet larger than major laterals; cauline 1.5–4.5 cm, stipules adnate to leaf, indistinguishable from pair of lobes, blade bractlike, not resembling basal, simple, 3-fid. Inflorescences 1-flowered. Pedicels densely puberulent, sometimes glandular. Flowers erect; epicalyx bractlets 4–8 mm; hypanthium green; sepals erect to erect-spreading, 7–12 mm; petals spreading, yellow, broadly obovate to nearly orbiculate, 14–16 mm, distinctly longer than sepals, apex broadly rounded to irregularly emarginate. Fruiting tori sessile, glabrous. Fruiting styles wholly persistent, not geniculate-jointed, 7–10 mm, apex not or ± hooked, pilose only on bases. 2n = 112.


Phenology: Flowering summer.
Habitat: Rocky runnels, cliffs, rock outcrops
Elevation: 500–1000 m

Discussion

Of conservation concern.

Geum schofieldii is one of the more attractive yet seldom seen species of avens in North America; it is known from the rocky wet mountains of the Queen Charlotte Islands and northern Vancouver Island.

Because Geum schofieldii appears to be intermediate morphologically between G. calthifolium and G. rossii, some botanists have considered it to be a hybrid and included it in synonymy with G. ×macranthum [G. calthifolium × G. rossii]. The 16-ploid chromosome number (2n = 112) of G. schofieldii suggests an allopolyploid origin. Geum rossii is not known to occur in the Queen Charlotte Islands or on Vancouver Island; the plants cannot be of recent hybrid origin. Geum ×macranthum is found in the Aleutian Islands and the Alaska Peninsula where the two parental species overlap. Compared to G. schofieldii, its leaves are more pinnate than lyrate-pinnate, with 9 to 13 major leaflets instead of 5 to 7. Also, G. ×macranthum appears to be sterile; G. schofieldii appears to be fertile, suggesting that the latter is a valid species. The distinctness of G. schofieldii pollen also supports its specific status (R. J. Hebda and C. C. Chinnappa 1990).

Selected References

None.

Lower Taxa

None.
... more about "Geum schofieldii"
pilose +  and glabrous +
Joseph R. Rohrer +
Calder & Roy L. Taylor +
compound +  and simple +
opposite +  and alternate +
5 cm50 mm <br />0.05 m <br /> (25 cm250 mm <br />0.25 m <br />) +
3-fid +  and bractlike +
free +  and distinct +
1.5 cm15 mm <br />0.015 m <br /> (4.5 cm45 mm <br />0.045 m <br />) +
Queen Charlotte avens +
not +  and aggregated +
500–1000 m +
0.4 cm4 mm <br />0.004 m <br /> (0.8 cm8 mm <br />0.008 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 runnels, cliffs, rock outcrops +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
crassinucellate +
2 +  and 8 +
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 +
purple-veined +
0 (?) +  and 4 (?) +
free +  and distinct +
distinctly longer +
1.4 cm14 mm <br />0.014 m <br /> (1.6 cm16 mm <br />0.016 m <br />) +
Flowering summer. +
adnate +, free +, connate +  and distinct +
Canad. J. Bot. +
not arillate +
persistent +
free +  and distinct +
erect +  and erect-spreading +
deltate-lanceolate +, deltate-ovate +  and deltate +
0.7 cm7 mm <br />0.007 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
Conservation concern +  and Endemic +
free +  and distinct +
1 +  and 5 +
13 cm130 mm <br />0.13 m <br /> (30 cm300 mm <br />0.3 m <br />) +
palmate +  and pinnate +
indistinguishable +
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 /> (?) +
Acomastylis +, Erythrocoma +, Novosieversia +  and Stylypus +
Geum schofieldii +
species +
major +  and larger +
inconspicuous +
hemispheric +  and cylindric +
enlarged +
not geniculate-jointed +
0.7 cm7 mm <br />0.007 m <br /> (1 cm10 mm <br />0.01 m <br />) +
hairy +  and glabrous +