Sagina decumbens subsp. occidentalis

(S. Watson) G. E. Crow

Rhodora 80: 68. 1978.

Basionym: Sagina occidentalis S. Watson Proc. Amer. Acad. Arts 10: 344. 1875
Treatment appears in FNA Volume 5. Treatment on page 145. Mentioned on page 146.
Revision as of 09:21, 30 July 2020 by imported>Volume Importer
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Leaves: basal rosette absent. Sepals ovate to orbiculate, body and hyaline margins frequently purple. Seeds light-brown, seldom ridged, and then never forming reticulate pattern, smooth to slightly pebbled.


Phenology: Flowering spring–early summer.
Habitat: Dryish hillsides, margins of vernal pools, streams, open spots in redwood and pine woods, roadsides, dwellings
Elevation: 0-900 m

Distribution

V5 298-distribution-map.gif

B.C., Calif., Oreg., Wash., Mexico (Baja California)

Discussion

Except by geography, subsp. occidentalis is very difficult to distinguish from subsp. decumbens. In plants of subsp. occidentalis the sepals tend to be more orbiculate and the capsules, prior to dehiscence, tend to be more globose. Extremely variable, subsp. decumbens generally can be recognized on the basis of presence of tuberculate seeds (60% frequency) and 80% have a combination of tuberculate seeds and glandular-pubescent pedicels and calyx bases. But when seeds are smooth, seeing the reticulate ridge pattern requires high magnification, and while SEM readily clarifies the differences, its use is hardly practical. Subspecies decumbens has a greater tendency to possess purple sepal tips or sepal margins, and purplish coloration frequently at the nodes.

Selected References

None.

Lower Taxa

None.

"dehiscing" is not a number.

conspicuous +
glandular-pubescent +  and glabrous +
acute;rounded +
Garrett E. Crow +
(S. Watson) G. E. Crow +
Sagina occidentalis +
Laciniate (?) +, Emarginate (?) +, Jagged (?) +, 2-fid (?) +  and Entire (?) +
inflated +
not +  and succulent +
reduced +
herbaceous +  and scarious +
glandular-pubescent +  and glabrous +
0.3 cm3 mm <br />0.003 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
1/4 +  and 1/2 +
globose;ovoid +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
minute +
conspicuous +
scarious +
dish--shaped +
expanded +
0.1 cm1 mm <br />0.001 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
B.C. +, Calif. +, Oreg. +, Wash. +  and Mexico (Baja California) +
0-900 m +
straight +  and curved +
central +  and peripheral +
apetalous +, 4-merous +  and 5-merous +
inconspicuous +
unisexual +  and bisexual +
stalked +  and simple +
Dryish hillsides, margins of vernal pools, streams, open spots in redwood and pine woods, roadsides, dwellings +
disc--shaped +  and dish +
not stipulate +  and petiolate +
connate +
conspicuous +
swollen +
3 +  and 5 +
crassinucellate +  and bitegmic +
campylotropous +
spreading;erect +
glandular-pubescent +  and glabrous +
0.2 cm2 mm <br />0.002 m <br /> (0.23 cm2.3 mm <br />0.0023 m <br />) +
fugacious +
slightly longer +
5 +  and 4 +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
Flowering spring–early summer. +
0.4 cm4 mm <br />0.004 m <br /> (2.3 cm23 mm <br />0.023 m <br />) +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.03 cm0.3 mm <br />3.0e-4 m <br />) +
light-brown +
smooth +  and slightly pebbled +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.14 cm1.4 mm <br />0.0014 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
persistent +
distinct +
5 +  and 4 +
ovate;orbiculate +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
Illustrated +
8 +, 10 +  and 5 +
many-branched +
purple-tinged +
procumbent +  and decumbent +
decumbent;ascending +
filiform +
subterminal +
[30 +, 5 +  and 4 +
papillate +
distinct +
5 +  and 4 +
list +  and count +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
Spergella +
Sagina decumbens subsp. occidentalis +
Sagina decumbens +
subspecies +
divided +
10 +  and 8 +
rhizomatous +  and taprooted +
glandular-pubescent +  and glabrous +
11 +, 7 +  and 6 +