Sedum laxum |
Sedum stenopetalum |
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rose-flower stonecrop |
narrow leaf stonecrop, narrow-petal stonecrop, worm-leaf stonecrop |
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Habit | Herbs, perennial, cespitose or not, glabrous. | Herbs, annual, biennial, or weakly perennial, tufted or not, glabrous. | ||||||||||||||||||||
Stems | root-stocks, ascending, much-branched, bearing rosettes. |
decumbent, branched, bearing terminal rosettes. |
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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, branched, 10–43 cm; leaf blades linear, base with scarious spurs; offsets rosettes, produced from axils of leaves and bracts. |
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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, spreading to erect, sessile; blade green, not glaucous, linear to elliptic-oblong (subulate when dry), subterete, 4.3–13.8 × 1.4–2.7 mm, base (persistent), spurred (spur simple, small), scarious, apex acute, (surfaces sometimes papillose marginally). |
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Inflorescences | elongate, paniculate cymes, 12–80-flowered, monochasially 3+-branched; branches not recurved, 2-forked; bracts similar to leaves, smaller. |
solitary flowers or cymes, 9–15(–25)-flowered, mostly 3-branched; branches slightly recurved, not forked; bracts linear-lanceolate, smaller than leaves, base spurred. |
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Pedicels | 0.6–6.3 mm. |
absent or to 0.5 mm. |
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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, distinct, pale green or yellow-green, lanceolate or ovate, equal, 2–3.7 × 0.9–1.7 mm, apex acute or long-acuminate; petals stellately spreading, distinct, deep yellow with green to brown dorsal keel to almost white, lanceolate or elliptic, slightly carinate, 5.4–8 mm, apex obtuse, acute, or long-acuminate, sometimes with aristate appendage; filaments yellow; anthers yellow; nectar scales greenish yellow or yellowish white, reniform-subquadrate or square. |
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Carpels | erect in fruit, distinct, brown. |
divergent in fruit, shortly connate, pale green, yellow-green, or brown. |
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2n | = 50–54, 58, 62–70, 63–64. |
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Sedum laxum |
Sedum stenopetalum |
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Distribution |
CA; OR
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CA; ID; MT; OR; WA; WY; AB; BC
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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.) |
Varieties 2 (2 in the flora). Mature follicles of Sedum stenopetalum are finely papillose, with prominent lips along the adaxial suture. Petal number can range from three to eight. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 8, p. 218. | FNA vol. 8, p. 209. | ||||||||||||||||||||
Parent taxa | Crassulaceae > Sedum | Crassulaceae > Sedum | ||||||||||||||||||||
Sibling taxa | ||||||||||||||||||||||
Subordinate taxa | ||||||||||||||||||||||
Synonyms | Gormania laxa | Amerosedum stenopetalum | ||||||||||||||||||||
Name authority | (Britton) A. Berger: in H. G. A. Engler et al., Nat. Pflanzenfam. ed. 2, 18a: 451. (1930) | Pursh: Fl. Amer. Sept. 1: 324. (1813) | ||||||||||||||||||||
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