Myosurus sessilis

S. Watson

Proc. Amer. Acad. Arts 17: 362. 1882.

Conservation concernEndemicIllustrated
Synonyms: Myosurus minimus var. sessiliflorus (Huth) G. R. Campbell
Treatment appears in FNA Volume 3.

Herbs, 0.8-2.5 cm. Leaf-blades linear or nearly so, 1.6-7.4 cm. Inflorescences: scapes 0-0.2 cm. Flowers: sepals indistinctly 3-veined, scarious margins broad; petal claw about as long as blade. Heads of achenes 8-25 × 2-4 mm, immersed among leaves. Achenes: outer face narrowly rhombic or occasionally narrowly oblong, 1.2-2 × 0.4-0.8 mm, 2-4.5 times as high as wide, not bordered; beak 0.8-1.8 mm, 0.6-1.1 times as long as body of achene, diverging from outer face of achene, heads of achenes thus strongly roughened by projecting achene beaks. 2n=16.


Phenology: Flowering spring (Mar–May).
Habitat: Vernal pools and alkalai flats
Elevation: 10-1600 m

Discussion

Of conservation concern.

Myosurus sessilis often grows with M. minimus, and hybrids between the two species are common. Because the plants mostly set seed by self-pollination, these hybrids often give rise to inbred lines showing the characteristics of the two parents in various combinations (D. E. Stone 1959). The names M. alopecuroides Greene and M. sessilis subsp. alopecuroides (Greene) D. E. Stone are based on the hybrid M. minimus × sessilis or on inbred lines descended from this hybrid.

Selected References

None.

Lower Taxa

None.
... more about "Myosurus sessilis"
Alan T. Whittemore +
S. Watson +
cuneate +, truncate +  and cordate +
straight +
0.6-1.1 times as long as body +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.18 cm1.8 mm <br />0.0018 m <br />) +
1.6 cm16 mm <br />0.016 m <br /> (7.4 cm74 mm <br />0.074 m <br />) +
globose;cylindric +
Calif. +  and Oreg. +
10-1600 m +
sessile +  and pedicellate +
showy +  and inconspicuous +
sessile +  and aggregate +
Vernal pools and alkalai flats +
0.8 cm8 mm <br />0.008 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
axillary +  and terminal +
whorled +, opposite +  and alternate +
tapering +  and filiform +
palmate +  and pinnate +
incised;toothed;incised;toothed;entire +
2-4.5 times as high as wide +
0.12 cm1.2 mm <br />0.0012 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.08 cm0.8 mm <br />8.0e-4 m <br />) +
distinct +
conspicuous +
reduced +
0.1 cm1 mm <br />0.001 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
Flowering spring (Mar–May). +
10 +  and 400 +
Proc. Amer. Acad. Arts +
0 cm0 mm <br />0 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
not arillate +  and stalked +
with scarious margins;green +
not persistent +
distinct +
3 +  and 6 +
oblong +  and elliptic lanceolate or oblanceolate +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
faceted +
Conservation concern +, Endemic +  and Illustrated +
persistent +
Myosurus minimus var. sessiliflorus +
Myosurus sessilis +
Myosurus +
species +
herbaceous +  and woody +