familyRosaceae
subfamilyRosaceae subfam. Rosoideae
tribeRosaceae tribe Colurieae
genusGeum
speciesGeum rossii

Geum rossii

(R. Brown) Seringe in A. P. de Candolle and A. L. P. P. de Candolle

in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. 2: 553. 1825.

Joseph R. Rohrer
Common names: Ross’s avens
Basionym: Sieversia rossii R. Brown Chlor. Melvill., 18, plate C. 1823
Synonyms: Acomastylis rossii (R. Brown) Greene Geum rossii var. depressum (Greene) C. L. Hitchcock G. rossii var. turbinatum (Rydberg) C. L. Hitchcock G. turbinatum S. gracilipes
Treatment appears in FNA Volume 9. Treatment on page 63. Mentioned on page 60, 64.

Plants subscapose. Stems 4–28 cm, glabrous or downy, hairs to 1 mm, sometimes septate-glandular. Leaves: basal 3–13 cm, blade pinnate to interruptedly pinnate, major leaflets 13–26, alternating with 0–14 minor ones, terminal leaflet slightly larger than major laterals; cauline 0.7–2 cm, stipules adnate to leaf, indistinguishable from pair of lobes, blade bractlike, not resembling basal, alternate, simple, pinnatifid to 3-fid. Inflorescences 1–3 (–4) -flowered. Pedicels woolly, sometimes glandular. Flowers erect; epicalyx bractlets 1.5–7 mm; hypanthium green, slightly purple-tinged to strongly purple; sepals erect to erect-spreading, 3–10 mm; petals spreading, yellow, obovate to nearly orbiculate, 5–12 (–17) mm, longer than sepals, apex broadly rounded to irregularly emarginate. Fruiting tori sessile, glabrous. Fruiting styles wholly persistent, not geniculate-jointed, 2–5 (–10) mm, apex not hooked, glabrous throughout or pilose only at base. 2n = 56.


Phenology: Flowering summer.
Habitat: Alpine and arctic tundra, rocky slopes, often in gravelly or peaty soil
Elevation: 0–4000 m

Distribution

V9 88-distribution-map.jpg

Greenland, B.C., N.W.T., Nunavut, Yukon, Alaska, Ariz., Colo., Idaho, Mont., Nev., N.Mex., Oreg., Utah, Wash., Wyo., e Asia (Russian Far East)

Discussion

The variability accommodated here in Geum rossii was distributed by earlier monographers such as P. A. Rydberg (1913b) and F. Bolle (1933) among a half dozen species. W. Gajewski (1957) reduced them to two species, G. rossii and G. turbinatum; most recent taxonomists have recognized the two taxa as subspecies or varieties of a single species. The large geographic discontinuity between the Rocky Mountain and arctic ranges makes it easy for those wishing to follow this tradition. No one morphologic character or combination of characters neatly separates the arctic plants from those of the Rockies.

Where their ranges overlap in Alaska, Geum rossii hybridizes with G. calthifolium to form sterile plants known as G. ×macranthum (Kearney ex Rydberg) B. Boivin; see discussion under 4. G. schofieldii.

Selected References

None.

Lower Taxa

None.

"thin" is not a number."elongating" is not a number. "elongating" is not a number.

... more about "Geum rossii"
RDF feed
2n chromosome quantity
56 +
Achene arrangement
aggregated +
Achene atypical quantity
250 (450) +
Achene quantity
20 (250) +
Androecium position
perigynous +
Anther dehiscence
dehiscent +
Apex architecture
sessile +
Apex pubescence
pilose +  and glabrous +
Apex shape
not hooked;broadly rounded;irregularly emarginate +
Author
Joseph R. Rohrer +
Authority
(R. Brown) Seringe in A. P. de Candolle and A. L. P. P. de Candolle +
Basal leaf architecture
compound +  and simple +
Basal leaf arrangement
opposite +  and alternate +
Basal leaf some measurement
3 cm30 mm <br />0.03 m <br /> (13 cm130 mm <br />0.13 m <br />) +
Basionyms
Sieversia rossii +
Blade architecture
simple +
Blade architecture or shape
pinnate;interruptedly pinnate +
Blade arrangement
not alternate +
Blade growth form or texture
herbaceous +
Blade shape
pinnatifid +  and 3-fid +
Blade texture
coriaceous +
Bract presence
absent +
Bracteole presence
absent +
Carpel atypical quantity
250 (450) +
Carpel fusion
free +  and distinct +
Carpel quantity
20 (250) +
Cauline leaf size
reduced +
Cauline leaf some measurement
0.7 cm7 mm <br />0.007 m <br /> (2 cm20 mm <br />0.02 m <br />) +
Common name
Ross’s avens +
Cyme architecture
open +
Distal portion duration
deciduous +
Distribution
Greenland +, B.C. +, N.W.T. +, Nunavut +, Yukon +, Alaska +, Ariz. +, Colo. +, Idaho +, Mont. +, Nev. +, N.Mex. +, Oreg. +, Utah +, Wash. +, Wyo. +  and e Asia (Russian Far East) +
Drupe arrangement
not +  and aggregated +
Drupelet arrangement
aggregated +
Elevation
0–4000 m +
Epicalyx bractlet presence
absent +
Epicalyx bractlet quantity
5 +
Epicalyx bractlet some measurement
0.15 cm1.5 mm <br />0.0015 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
Flower diameter
0.4 cm4 mm <br />0.004 m <br /> (4.6 cm46 mm <br />0.046 m <br />) +
Flower orientation
erect +
Flower reproduction
unisexual +  and bisexual +
Follicle arrangement
not +  and aggregated +
Fruit shape
tapered +, ovoid +  and fusiform +
Fruit some measurement
0.2 cm2 mm <br />0.002 m <br /> (0.45 cm4.5 mm <br />0.0045 m <br />) +
Fruits achene arrangement
aggregated +
Glomerule arrangement
fascicles +
Habitat
Alpine and arctic tundra, rocky slopes, often in gravelly or peaty soil +
Hair architecture or function or pubescence
septate-glandular +
Hair some measurement
0 cm0 mm <br />0 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
Hypanthium coloration
slightly purple-tinged +  and strongly purple +
Hypanthium duration
persistent +
Hypanthium shape
saucer-shaped +  and cupshaped +
Hypanthium some measurement
0.2 cm2 mm <br />0.002 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
Hypanthium texture
fleshy +
Illustration copyright
Flora of North America Association +
Illustrator
Marjorie C. Leggitt +
Inflorescence architecture
1-3(-4)-flowered +
Inflorescence position
axillary +
Inflorescence position or structure subtype
terminal +
Integument architecture
crassinucellate +
Integument quantity
2 +
Lateral size
major +
Leaf architecture
odd-pinnate +, lyrate-pinnate +, 3-foliolate +  and simple +
Leaf arrangement
opposite +  and alternate +
Leaf duration
winter-persistent +
Leaf position
cauline +  and basal +
Leaflet arrangement
alternating +
Leaflet quantity
13 (26) +
Leaflet shape
cordate +, reniform +, orbiculate +, oblanceolate +, obovate +, oblong +, elliptic +  and rhombic +
Leaflet size
major +
Margin architecture
palmate +  and pinnate +
Margin architecture or shape
serrate +
Margin shape
crenate +, dentate +, laciniate +, 2-7-lobed +, flat +, lobed +, toothed +  and entire +
Minor quantity
0 (14) +
Nectar disc presence
absent +
Number of lower taxa
0 +
Nutlet arrangement
aggregated +
Ovary position
inferior +  and superior +
Ovule arrangement
clustered +, biseriate +  and superposed +
Ovule arrangement or position
superposed +
Ovule atypical quantity
2 (5) +
Ovule position
basal +
Ovule quantity
1 +
Pedicel architecture or function or pubescence
glandular +
Pedicel presence
absent +
Pedicel pubescence
woolly +
Perianth position
perigynous +
Petal architecture
purple-veined +
Petal atypical quantity
0 (?) +  and 4 (?) +
Petal atypical some measurement
1.2 cm12 mm <br />0.012 m <br /> (1.7 cm17 mm <br />0.017 m <br />) +
Petal coloration
yellow +
Petal fusion
free +  and distinct +
Petal length or size
longer +
Petal orientation
spreading +
Petal quantity
5 +
Petal shape
obovate;nearly orbiculate +
Petal some measurement
0.5 cm5 mm <br />0.005 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
Petiole presence
absent +
Phenology
Flowering summer. +
Pistil atypical quantity
250 (450) +
Pistil fusion
adnate +, free +, connate +  and distinct +
Pistil quantity
1;250 +
Publication title
in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. +
Publication year
1825 +
Reference
None +
Seed architecture
not arillate +
Seed atypical quantity
2 (12) +
Seed quantity
2;1 +
Sepal atypical quantity
5 (10) +
Sepal duration
persistent +
Sepal fusion
free +  and distinct +
Sepal orientation
erect +  and erect-spreading +
Sepal quantity
5 +
Sepal shape
deltate-lanceolate +, deltate-ovate +  and deltate +
Sepal some measurement
0.3 cm3 mm <br />0.003 m <br /> (1 cm10 mm <br />0.01 m <br />) +
Source xml
https://bibilujan@bitbucket.org/aafc-mbb/fna-fine-grained-xml.git/src/84153f6d59a0a91d69695978a64cee7560374f8e/V9/V9 88.xml +
Stamen atypical quantity
10 (25) +
Stamen fusion
free +  and distinct +
Stamen height or length or size
shorter +
Stamen quantity
25;120 +
Stem architecture
simple +
Stem orientation
erect +
Stem pubescence
downy;glabrous +
Stem quantity
1 +  and 5 +
Stem some measurement
4 cm40 mm <br />0.04 m <br /> (28 cm280 mm <br />0.28 m <br />) +
Stigma architecture or shape
capitate +
Stipule architecture
palmate +  and pinnate +
Stipule duration
persistent +
Stipule fusion
adnate +
Stipule presence
absent +
Stipule prominence
indistinguishable +
Stipule shape
ovate;lanceolate;ovate;lanceolate;linear +
Style architecture
geniculate-jointed +  and entire +
Style duration
persistent +
Style fusion
distinct +
Style position
basal +, lateral +, subterminal +  and terminal +
Style position or structure subtype
terminal +
Style pubescence
hairy +  and glabrous +
Style shape
not hooked +  and hooked +
Style size
accrescent +
Style some measurement
10 cm100 mm <br />0.1 m <br /> (?) +
Synonyms
Acomastylis rossii +, Geum rossii var. depressum +, G. rossii var. turbinatum +, G. turbinatum +  and S. gracilipes +
Taxon family
Rosaceae +
Taxon name
Geum rossii +
Taxon parent
Geum +
Taxon rank
species +
Terminal leaflet size
slightly larger +
Torus development
developed +
Torus presence
absent +
Torus prominence
inconspicuous +
Torus shape
hemispheric +  and cylindric +
Torus size
enlarged +
Volume
Volume 9 +
Whole-organism architecture
not geniculate-jointed +
Whole-organism atypical some measurement
0.5 cm5 mm <br />0.005 m <br /> (1 cm10 mm <br />0.01 m <br />) +
Whole-organism duration
persistent +
Whole-organism some measurement
0.2 cm2 mm <br />0.002 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
Whole organism architecture
subscapose +
Whole organism duration
perennial +
Whole organism growth form
plant +
Whole organism pubescence
hairy +  and glabrous +
Whole organism some measurement
1dm (12dm) +
X chromosome atypical quantity
8 +
X chromosome quantity
7 +