Sedum laxum |
Sedum album |
|||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
rose-flower stonecrop |
white stonecrop |
|||||||||||||||||
Habit | Herbs, perennial, cespitose or not, glabrous. | Herbs, perennial, laxly cespitose, minutely puberulent, papillose. | ||||||||||||||||
Stems | root-stocks, ascending, much-branched, bearing rosettes. |
creeping and short-ascending, much-branched, (densely glandular-pubescent basally), not bearing rosettes. |
||||||||||||||||
Flowering shoots | erect or decumbent, simple or branched, 4–30(–40) cm; leaf blades oblanceolate, spatulate, obovate, or suborbiculate, base not spurred; offsets not formed. |
erect, simple or branched, 5–18(–30) cm, (glabrous or sparsely hairy); leaf blades linear to ovate, base scarcely spurred; offsets not formed. |
||||||||||||||||
Leaves | alternate, erect to spreading, sessile; blade green, glaucous or not, not pruinose, oblanceolate, spatulate, or obovate, subterete or somewhat flattened, 10–50 × (4.5–)6–33 mm, base not spurred, not scarious, apex truncate to rounded or obtuse, emarginate or barely notched. |
alternate, patent or appressed, sessile; blade green, often reddish, not glaucous, linear to ovate, subterete but adaxial surface somewhat flattened, 4–20(–25) × 1–20 mm, base scarcely spurred, not scarious, apex obtuse or rounded, (surfaces glabrous or sparsely hairy). |
||||||||||||||||
Inflorescences | elongate, paniculate cymes, 12–80-flowered, monochasially 3+-branched; branches not recurved, 2-forked; bracts similar to leaves, smaller. |
paniculate cymes, 15–50+-flowered, 3–5-branched; branches reflexed, forked; bracts similar to leaves, smaller. |
||||||||||||||||
Pedicels | 0.6–6.3 mm. |
3–5 mm. |
||||||||||||||||
Flowers | 5-merous; sepals erect, (closely appressed to corolla tube), slightly connate basally, pale green, ovate or lanceolate, equal, (2–)2.6–5.1 × 2 mm, apex acute or subacute, (rarely obtuse in var. flavidum); petals basally erect, divergent in distal 1/2, connate basally, pink, pinkish white, or white to yellowish white, lanceolate-oblong, oblanceolate-oblong, or elliptic-oblong, not carinate, 4–11 mm, apex obtuse, shortly mucronate or aristate; filaments white, greenish white, or pink; anthers red, reddish purple, red-brown, or yellow; nectar scales white, yellow, or pink, reniform or transversely oblong. |
5-merous; sepals erect, connate basally, green, ovate to triangular, equal, 0.5–1.5 × 0.2–0.5 mm, apex acute, (glabrous or sparsely and minutely puberulent); petals spreading, distinct, white or rarely pink, lanceolate, not carinate, 2–4.5 mm, apex subacute; filaments white; anthers red; nectar scales white or yellow, spatulate. |
||||||||||||||||
Carpels | erect in fruit, distinct, brown. |
erect in fruit, distinct, whitish. |
||||||||||||||||
2n | = 34, 51, 68, 85, 102, 136. |
|||||||||||||||||
Sedum laxum |
Sedum album |
|||||||||||||||||
Phenology | Flowering summer–fall. | |||||||||||||||||
Habitat | Calcareous rock ledges, gravelly flat areas, ruderal areas | |||||||||||||||||
Elevation | 60-1400 m (200-4600 ft) | |||||||||||||||||
Distribution |
CA; OR
|
CA; IN; ME; MI; NJ; NY; OH; OR; PA; UT; WA; WV; BC; NB; ON; QC; Europe [Introduced in North America]
|
||||||||||||||||
Discussion | Varieties 5 (5 in the flora). Sedum laxum is unusual in forming offsets in axils of rosette leaves rather than on a rootstock or creeping stem. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Sedum album was first reported as naturalized in the United States in 1934. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
||||||||||||||||
Key |
|
|||||||||||||||||
Source | FNA vol. 8, p. 218. | FNA vol. 8, p. 213. | ||||||||||||||||
Parent taxa | Crassulaceae > Sedum | Crassulaceae > Sedum | ||||||||||||||||
Sibling taxa | ||||||||||||||||||
Subordinate taxa | ||||||||||||||||||
Synonyms | Gormania laxa | |||||||||||||||||
Name authority | (Britton) A. Berger: in H. G. A. Engler et al., Nat. Pflanzenfam. ed. 2, 18a: 451. (1930) | Linnaeus: Sp. Pl. 1: 432. (1753) | ||||||||||||||||
Web links |
|