Sedum rupestre
Sedum robertsianum
crooked yellow stonecrop, Jenny's stonecrop
procumbent, rooting, simple, (basally often somewhat woody), bearing rosettes.
decumbent, branched basally, (fleshy), with numerous decumbent branchlets, not forming rosettes.
erect or ascending, drooping when young, simple, 15–35 cm;
leaf blades linear, base spurred;
offsets not formed.
(axillary), erect, simple or branched, 5–10 cm;
leaf blades ovate, base not spurred;
offsets not formed.
alternate, (imbricate), ascending, sessile;
blade green, sometimes glaucous, linear to oblong, terete, 10–15 × 1–3 mm, base with truncate spur, not scarious, apex mucronate.
(persistent), alternate, spreading, sessile;
blade yellow-green, not glaucous, ovate, subterete, somewhat flattened, 5–8 × 3–4 mm, (thick, turgid), base not spurred, not scarious, apex apiculate, (surfaces minutely papillose, caused by reflections of inner facets of windowed cells).
terminal corymbiform cymes, 15–25+-flowered, monochasially 3–7-branched, (sparsely glandular-hairy);
branches recurved, not forked;
bracts similar to leaves.
cymes, 6–12-flowered, simple or 2-branched, sometimes with short branch at base with solitary flower;
branches not recurved, sometimes forked;
bracts similar to leaves, smaller.
absent or to 1 mm.
absent or to 0.5 mm.
(5–)7(–9)-merous;
sepals erect, connate basally, yellowish green, ovate, equal, 2–3(–3.3) × 1.5–2 mm, apex acute-acuminate, (glabrous or sparsely glandular-pubescent);
petals spreading, distinct, yellow, oblong, slightly carinate, 6–7 mm, apex acute;
filaments yellow;
anthers yellow;
nectar scales yellow, transversely oblong.
(4–)5-merous;
sepals spreading to reflexed, distinct, yellow-green, lanceolate, unequal, ca. 2 × ca. 0.8 mm, apex obtuse;
petals spreading, nearly distinct, bright yellow, lanceolate, canaliculate, ca. 4 mm, apex acute;
filaments color unknown;
anthers color unknown;
nectar scales pale yellow, oblong.
erect in fruit, distinct, brown.
spreading, distinct, tan to reddish.
= 56, 88, 112, 120.
= 28.
Sedum rupestre
Sedum robertsianum
Specimens of waifs of Sedum rupestre are known from as early as 1876 in Massachusetts. It was first reported as cultivated in the United States in 1914. Most naturalized records of S. rupestre in North America have been incorrectly named S. reflexum. Sedum rupestre is ephemeral on Prince Edward Island, probably not truly established, and is a garden escape in Ontario.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Sedum robertsianum occurs in the Del Norte and Glass mountains of Brewster County.
Sedum robertsianum is a somewhat confusing taxonomic entity. In a treatment contributed in the 1970s for the Flora of the Chihuahuan Desert Region (M. C. Johnston and J. S. Henrickson, in prep.), R. T. Clausen placed S. robertsianum in synonymy with Mexican S. parvum but did not assign it to subspecies status. However, only subsp. nanifolium occurred in both Texas and Mexico. Later, Clausen (1981) made S. robertsianum a subspecies of S. parvum. In a study of the systematics of the S. parvum complex, G. L. Nesom and B. L. Turner (1995) treated S. robertsianum as a species of uncertain status. They cited specimens from the Del Norte Mountains (the type locality of S. robertsianum, see Clausen 1981) as S. nanifolium, which they elevated from S. parvum subsp. nanifolium. It is possible that there are two species of yellow-flowered sedums within one mountain range in western Texas. It is also possible that there is only one species, and either S. robertsianum is synonymous with S. nanifolium, or it is a distinct species and the only Sedum in the Del Norte Mountains of western Texas.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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