Sagina japonica |
Sagina caespitosa |
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Japanese pearlwort, sagine du japon |
sagine cespiteuse, tuft pearlwort |
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Habit | Plants annual, glandular-pubescent. | Plants perennial, cespitose, forming small mats or cushions, glandular-pubescent or glabrous. |
Stems | ascending to spreading, much-branched, usually filiform, frequently glandular-pubescent distally. |
ascending to spreading, frequently purple tinged, many-branched, not filiform. |
Leaves | axillary fascicles rarely present; basal frequently in tuft of ascending leaves, rosette rarely present, blade linear, 4–10 mm, succulent, apex apiculate, glabrous; cauline leaves conspicuously connate basally, forming shallow, scarious cup, blade linear, fleshy, apex apiculate, glabrous or rarely pubescent; proximal leaf blades 9–20 mm, becoming shorter distally, 4–7 mm. |
axillary fascicles absent; basal not in primary rosettes, secondary rosettes usually present, blade linear to linear-subulate, 2–13 mm, not fleshy, apex apiculate to acute, glabrous; cauline connate basally, forming shallow, often purplish, scarious cup, blade with frequently conspicuous midvein, subulate, 3–9(–12) mm, becoming shorter toward apex, not fleshy, apex apiculate to acute, glabrous. |
Pedicels | slender, distal portion densely glandular-pubescent, becoming less densely glandular-pubescent proximally, proximal 1/4 usually glabrous. |
filiform, glandular-pubescent, rarely glabrous. |
Flowers | axillary, 5-merous; calyx glandular-pubescent basally; sepals elliptic to orbiculate, 2–2.5 mm, hyaline margins whitish, apex obtuse to rounded, glandular-pubescent, remaining appressed following capsule dehiscence; petals ovate to orbiculate, 1–2 mm, shorter than sepals; stamens 5 or 10. |
terminal, 5-merous or 4- and 5-merous; calyx base glandular-pubescent or glabrous; sepals broadly ovate to lanceolate, 2–2.5 mm, hyaline margins usually purple tinged, at least at apex, apex obtuse to somewhat acute, glandular-pubescent or glabrous, remaining appressed after capsule dehiscence; petals elliptic to narrowly obovate, 2.5–3 mm, longer than or seldom equaling sepals; stamens 8 or 10. |
Capsules | 2.5–3 mm, exceeding sepals, dehiscing ca. 1/4 length. |
3–3.5 mm, exceeding sepals, dehiscing to base. |
Seeds | dark brown, reniform to nearly globose, plump, abaxial groove absent, 0.4–0.5 mm, densely tuberculate or strongly pebbled (e North America). |
brown, obliquely triangular with abaxial groove, 0.5 mm, lateral surfaces frequently with elongate ridges, abaxial surface appearing smooth to pebbled. |
Sagina japonica |
Sagina caespitosa |
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Phenology | Flowering early–late summer. | Flowering mid-late summer. |
Habitat | Dryish sites, waste places | Wet sands and gravels of shorelines and stream margins, wet mossy places, dry rocky barrens, gravelly hillocks |
Elevation | 200 m (700 ft) | 0-1300 m (0-4300 ft) |
Distribution |
CT; IL; MA; NH; NY; OH; OR; PA; RI; VT; BC; NF; ON; QC; e Asia [Introduced in North America; introduced in Mexico (Veracruz)]
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MB; NL; NU; QC; Greenland; arctic Europe |
Discussion | Sagina japonica was recently introduced in widely scattered locations in northeastern North America, and can be found especially in gravelly roadsides, walkways, and driveways. The plants tend to be much less robust and without distinctly succulent leaves. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Source | FNA vol. 5, p. 147. | FNA vol. 5, p. 144. |
Parent taxa | Caryophyllaceae > subfam. Alsinoideae > Sagina | Caryophyllaceae > subfam. Alsinoideae > Sagina |
Sibling taxa | ||
Synonyms | Spergula japonica | S. nivalis var. caespitosa, Spergella caespitosa |
Name authority | (Swartz) Ohwi: J. Jap. Bot. 13: 438. (1937) | Lange: in H. J. Rink, Grønland 2: 133. (1857) |
Web links |