Stellaria humifusa

Rottbøll

Skr. Kiøbenhavnske Selsk. Laerd. Elsk. 10: 447, plate 4, fig. 14. 1770.

Common names: Salt-marsh starwort
Synonyms: Alsine humifusa (Rottbøll) Britton Stellaria humifusa var. marginata Fenzl Stellaria humifusa var. oblongifolia Fenzl Stellaria humifusa var. suberecta B. Boivin
Treatment appears in FNA Volume 5. Treatment on page 106. Mentioned on page 96, 98, 103.

Plants perennial, forming small to large mats or clumps, from slender rhizomes. Stems decumbent, freely branched, square, 2–20 cm, glabrous, rooting at proximal nodes. Leaves sessile; blade elliptic to elliptic-lanceolate, 0.4–1.5 cm × 1–5 mm, succulent, base cuneate to rounded, margins entire, apex acute to obtuse, glabrous or with few cilia along margins. Inflorescences with flowers solitary in axils of foliage leaves; bracts absent. Pedicels ascending, straight or nearly so, usually 5–10 (–30) mm, glabrous. Flowers ca. 10 mm diam.; sepals 5, prominently 1–3-veined, lanceolate, 4–5 mm, margins convex, narrow, scarious, apex acute, glabrous; petals 5, 4–6 mm, equaling sepals; stamens 10; styles 3, ascending and outwardly curved, 1–1.5 mm. Capsules straw colored, ovoid, 4–5 mm, equaling sepals, apex obtuse, opening by 6 valves; carpophore absent. Seeds pale-brown, broadly and obliquely reniform, 0.8–1 mm diam., smooth to slightly rugose. 2n = 26.


Phenology: Flowering summer.
Habitat: Lake shores, beaches, marshes, salt marshes, mainly northern coastal
Elevation: 0-100 m

Distribution

V5 220-distribution-map.gif

Greenland, St. Pierre and Miquelon, B.C., Man., N.B., Nfld. and Labr., N.W.T., N.S., Nunavut, Ont., P.E.I., Que., Yukon, Alaska, Maine, arctic Europe, Asia (Russian Far East), Asia (Siberia)

Discussion

Stellaria humifusa is often confused with S. crassifolia, but has thicker stems and fleshy leaves that wrinkle and tend to turn brownish when dried. Also, in S. crassifolia the long pedicels are very slender and sharply angled below the capsule.

Lower Taxa

None.
... more about "Stellaria humifusa"
perigynous +  and hypogynous +
glabrous +  and with few cilia +
obtuse;acute;acute;obtuse +
John K. Morton +
Rottbøll +
cuneate;rounded +
Laciniate (?) +, Emarginate (?) +, Jagged (?) +, 2-fid (?) +  and Entire (?) +
0.4 cm4 mm <br />0.004 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
elliptic +  and elliptic-lanceolate +
succulent +
0.1 cm1 mm <br />0.001 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
reduced +
straw colored +
ascending;recurved +
10 +, 8 +  and 4 +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
Salt-marsh starwort +
umbellate +  and open +
dish--shaped +
expanded +
Greenland +, St. Pierre and Miquelon +, B.C. +, Man. +, N.B. +, Nfld. and Labr. +, N.W.T. +, N.S. +, Nunavut +, Ont. +, P.E.I. +, Que. +, Yukon +, Alaska +, Maine +, arctic Europe +, Asia (Russian Far East) +  and Asia (Siberia) +
0-100 m +
straight +  and curved +
central +  and peripheral +
10 cm100 mm <br />0.1 m <br /> (?) +
inconspicuous +
stalked +  and simple +
Lake shores, beaches, marshes, salt marshes, mainly northern coastal +
connate +
small;large +
swollen +
3 +  and 5 +
crassinucellate +  and bitegmic +
campylotropous +
1 cm10 mm <br />0.01 m <br /> (3 cm30 mm <br />0.03 m <br />) +
nearly +  and straight +
0.5 cm5 mm <br />0.005 m <br /> (1 cm10 mm <br />0.01 m <br />) +
perigynous +  and hypogynous +
fugacious +
not clawed +
0.4 cm4 mm <br />0.004 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
Flowering summer. +
Skr. Kiøbenhavnske Selsk. Laerd. Elsk. +
boivin1954a +
pale-brown +
0.8mm;1mm +
smooth +  and slightly rugose +
reniform +
red +, purple-tinged +  and green +
persistent +
distinct +
lanceolate +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
rooting +  and branched +
prostrate;ascending or erect +
2 cm20 mm <br />0.02 m <br /> (20 cm200 mm <br />0.2 m <br />) +
subterminal +  and terminal +
[30 +  and 3 +
papillate +
distinct +
capitate +  and clavate +
0.1 cm1 mm <br />0.001 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
Alsine humifusa +, Stellaria humifusa var. marginata +, Stellaria humifusa var. oblongifolia +  and Stellaria humifusa var. suberecta +
rooting +  and rhizomatous +
Stellaria humifusa +
Stellaria +
species +
divided +
10 +  and 8 +
rhizomatous +  and taprooted +
pubescence of simple hairs or stalked glands +  and glabrous +
15 +, 13 +, 12 +, 11 +  and 10 +