Holosteum
Sp. Pl. 1: 88. 1753.
Gen. Pl. ed. 5, 39. 1754.
| Taxon | Illustrator ⠉ | |
|---|---|---|
 | Moenchia erecta Holosteum umbellatum subsp. umbellatum Myosoton aquaticum | Barbara Alongi Barbara Alongi Barbara Alongi |
Herbs, annual or winter-annual. Taproots slender. Stems ascending to erect, simple or branched, terete. Leaves forming basal rosette, connate proximally into sheath, petiolate (proximal leaves) or sessile (cauline leaves); blade 1-veined, oblanceolate to spatulate (proximal leaves) or elliptic to ovate (cauline leaves), somewhat succulent, apex acute. Inflorescences terminal, umbellate cymes, sometimes not yet developed in young individuals, then with 2–4 bracts and often buds at base of pedicel; bracts clustered, foliaceous with scarious margins to entirely scarious. Pedicels reflexed after flowering, erect in fruit. Flowers bisexual or occasionally unisexual and pistillate; perianth and androecium hypogynous; sepals 5, distinct, green, lanceolate to ovate, 2.5–4.5 mm, herbaceous, margins white, scarious, apex acute to obtuse, not hooded; petals 5, white to pink, clawed, blade apex jagged but not 2-fid; nectaries not apparent; stamens 3–5, arising from base of ovary; filaments distinct nearly to base; staminodes absent; styles 3 (–5), clavate to filiform, 0.5–1.5 mm, glabrous proximally; stigmas 3 (–5), subterminal to linear along adaxial surface of styles, minutely papillate (50×). Capsules ovoid to cylindric, opening by 6 (rarely 8 or 10) revolute teeth; carpophore absent. Seeds 35–60, orange to brown, oblong, shield-shaped, dorsiventrally compressed, papillate, marginal wing absent, appendage absent; embryo central, straight. x = 10.
Distribution
Introduced; Europe (e Mediterranean region), c, sw Asia, Africa (Mediterranean region), Africa (s to Ethiopia), in South America (Argentina), w Europe, Africa (Republic of South Africa)
Discussion
Species 3–4 (1 in the flora).