Rosa spithamea

S. Watson in W. H. Brewer et al.

in W. H. Brewer et al., Bot. California 2: 444. 1880.

Common names: Coast ground rose
EndemicIllustrated
Synonyms: Rosa granulata Greene R. sonomensis Greene R. spithamea var. sonomensis (Greene) Jepson
Treatment appears in FNA Volume 9. Treatment on page 118. Mentioned on page 97, 116, 117, 119.

Subshrubs, forming open colonies. Stems erect, 1–5 (–10) dm, openly branched; bark dark reddish-brown, glabrous; infrastipular prickles paired, erect to slightly curved, largest sometimes ± flattened, subulate, 2–8 (–12) × 2–5 mm, base glabrous, internodal prickles absent or sparse to dense, mixed with aciculi, aciculi sometimes absent, stipitate-glandular or eglandular. Leaves 3–10 cm; stipules 6–15 × 1.5–2.5 (–3.5) mm, auricles flared to ± erect, 1.5–6 mm, margins entire, stipitate-glandular, surfaces glabrous, eglandular; petiole and rachis with pricklets, usually glabrous, rarely finely hairy, stipitate-glandular; leaflets 5–7 (–9), terminal: petiolule 3–13 mm, blade ovate-elliptic, sometimes obovate-elliptic, 10–30 × 8–20 mm, membranous to ± leathery, base obtuse, margins ± 2-serrate, teeth 8–20 per side, acute to obtuse, gland-tipped, apex obtuse to ± truncate, abaxial surfaces pale green to green, glabrous, sometimes sparsely hairy, sessile-glandular or eglandular, adaxial green, dull, rarely sparsely hairy. Inflorescences corymbs, 1–10-flowered. Pedicels erect, slender to stout, 2–15 mm, glabrous, rarely finely pubescent, stipitate-glandular, sometimes setose-glandular; bracts 1 or 2, lanceolate, 2–15 × 1.5–5 mm, margins entire, stipitate-glandular, surfaces glabrous, eglandular. Flowers 2.5–3.8 cm diam.; hypanthium ± ovoid, 3–6 × 2.5–5 mm, glabrous, sparsely to densely stipitate to setose-glandular, rarely eglandular, neck 0.5–1 × 2.5–4 mm; sepals spreading, ovatelanceolate, 8–15 × 2.5–3.5 mm, tip 0–4 × 1.3 mm, margins entire, abaxial surfaces glabrous, stipitate-glandular; petals single, deep pink, 12–23 × 15 mm; carpels 15–30, styles exsert 1 mm beyond stylar orifice (2 mm diam.) of hypanthial disc (3.5 mm diam.). Hips scarlet, ± depressed-subglobose, 7–15 × 7–15 mm, fleshy, glabrous, sparsely to densely stipitate to setose-glandular, rarely eglandular, neck 0.5–2 × 2–5 mm; sepals persistent, erect. Achenes basiparietal, 4–17, cream to pale-brown, 3.5–5 × 2.5–3.5 mm. 2n = 14.


Phenology: Flowering May–Aug.
Habitat: Edges and understory of chaparral and mixed forests, post-burn openings
Elevation: 200–2000 m

Discussion

The combination of miniature size and stipitate- to setose-glandular hips makes Rosa spithamea one of the more easily and reliably identified species in the genus, although the density of hypanthial glands can vary. The species occurs from Douglas County, Oregon, to San Luis Obispo County, California. Rosa spithamea is fire-adapted and blooms profusely only after fires or equivalent disturbances; at other times, it persists in the understory in a vegetative state.

E. W. Erlanson (1934) referred to Rosa spithamea as tetraploid (2n = 28); twice in her key to R. spithamea she questioned that count.

Selected References

None.

Lower Taxa

None.

"dm" is not declared as a valid unit of measurement for this property.

... more about "Rosa spithamea"
eglandular +  and sessile-glandular +
pale green +  and green +
stipitate-glandular +, glabrous +  and hairy +
cream +  and pale-brown +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
basiparietal +  and basal +
2.5mm +  and 3.5mm +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
Walter H. Lewis +, Barbara Ertter +  and Anne Bruneau +
S. Watson in W. H. Brewer et al. +
dark reddish-brown +
exfoliating +
compound +  and simple +
opposite +  and alternate +
4 cm40 mm <br />0.04 m <br /> (6.3 cm63 mm <br />0.063 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
1 cm10 mm <br />0.01 m <br /> (3 cm30 mm <br />0.03 m <br />) +
lustrous +  and dull +
obovate-elliptic +  and ovate-elliptic +
1 cm10 mm <br />0.01 m <br /> (3 cm30 mm <br />0.03 m <br />) +
? (?) +  and ? (?) +
8mm +  and 20mm +
persistent +
0.2 cm2 mm <br />0.002 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
lanceolate +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
free +  and distinct +
Coast ground rose +
1-16(-50)-flowered +
rarely puberulent +  and tomentose +
rarely puberulent +  and tomentose +
Calif. +  and Oreg. +
not +  and aggregated +
200–2000 m +
2.5 cm25 mm <br />0.025 m <br /> (3.8 cm38 mm <br />0.038 m <br />) +
not +  and aggregated +
eglandular +  and glandular +
urceolate +, pyriform +, oblong +, ellipsoid +, ovoid-obovoid +  and globose +
Edges and understory of chaparral and mixed forests, post-burn openings +
eglandular +, stipitate +  and setose-glandular +
1.8 cm18 mm <br />0.018 m <br /> (2.4 cm24 mm <br />0.024 m <br />) +
1.5 cm15 mm <br />0.015 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
0.7 cm7 mm <br />0.007 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
depressed-subglobose +
0.7 cm7 mm <br />0.007 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
conic +  and flat +
eglandular +, stipitate +  and setose-glandular +
0.5 cm5 mm <br />0.005 m <br /> (1 cm10 mm <br />0.01 m <br />) +
purplish black +, purplish red +, orange-red +  and red +
0.3 cm3 mm <br />0.003 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
leathery +  and fleshy +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
1-16(-50)-flowered +
crassinucellate +
stipitate-glandular +
3-foliate +  and compound +
11 cm110 mm <br />0.11 m <br /> (17 cm170 mm <br />0.17 m <br />) +
deciduous +
3 cm30 mm <br />0.03 m <br /> (10 cm100 mm <br />0.1 m <br />) +
leathery +  and membranous +
petiolulate +  and subsessile +
elliptic +  and obovate more or less oblong obovate-elliptic lanceolate-elliptic or obovate-oblong +
entire +  and 2-serrate +
stipitate-glandular +
pinnatifid +, entire +, undulate +, sinuate +  and serrulate +
distinct +
0.5mm +  and 2mm +
0.2 cm2 mm <br />0.002 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
inferior +  and superior +
clustered +, biseriate +  and superposed +
1-30(-50)-flowered +
setose-glandular +, sessile +, stipitate +  and eglandular +
2 cm20 mm <br />0.02 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
stipitate-glandular +, pubescent +  and glabrous +
slender +  and stout +
0.2 cm2 mm <br />0.002 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
free +  and distinct +
1.2 cm12 mm <br />0.012 m <br /> (2.3 cm23 mm <br />0.023 m <br />) +
15 cm150 mm <br />0.15 m <br /> (?) +
stipitate-glandular +, hairy +  and glabrous +
1.5 cm15 mm <br />0.015 m <br /> (2 cm20 mm <br />0.02 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (1.3 cm13 mm <br />0.013 m <br />) +
Flowering May–Aug. +
adnate +, free +, connate +  and distinct +
0.8 cm8 mm <br />0.008 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
subulate +  and flattened +
0.2 cm2 mm <br />0.002 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
in W. H. Brewer et al., Bot. California +
stipitate-glandular +, hairy +  and glabrous +
0.5 cm5 mm <br />0.005 m <br /> (?) +
not arillate +
3 cm30 mm <br />0.03 m <br /> (4 cm40 mm <br />0.04 m <br />) +
persistent +
free +  and distinct +
erect +  and spreading +
ovatelanceolate +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
rarely densely puberulent +  and tomentose +
Endemic +  and Illustrated +
free +  and distinct +
flexuous +
procumbent +  and sprawling +
1 +  and 20 +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
0.6 cm6 mm <br />0.006 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
persistent +
not elongate +
1 cm10 mm <br />0.01 m <br /> (?) +
Rosa granulata +, R. sonomensis +  and R. spithamea var. sonomensis +
Rosa spithamea +
Rosa sect. Rosa +
species +
0mm +  and 4mm +
1.3 cm13 mm <br />0.013 m <br /> (?) +
gland-tipped +
8 +  and 20 +
acute +  and obtuse +
inconspicuous +
enlarged +  and small +
small +  and miniature +