Sedum oreganum
Sedum robertsianum
Oregon stonecrop
rootstocks and decumbent branches, (stout), bearing terminal rosettes.
decumbent, branched basally, (fleshy), with numerous decumbent branchlets, not forming rosettes.
erect, simple or branched, 8–13 cm;
leaf blades spatulate or cuneate, base short-spurred;
offsets not formed.
(axillary), erect, simple or branched, 5–10 cm;
leaf blades ovate, base not spurred;
offsets not formed.
alternate, spreading, sessile;
blade lustrous light green, not glaucous, spatulate or cuneate, laminar (thickest near apex), 7–12 × 4.4–9 mm, base short-spurred, not scarious, apex broadly rounded or truncate.
(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).
dense corymbs, 5–10-flowered, 3-branched;
branches spreading to erect, primary branch dichotomously forked;
bracts spatulate or oblanceolate, 5–8 mm, base spurred.
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 0.4–3+ mm.
absent or to 0.5 mm.
5-merous;
sepals erect, connate basally, green, ovate-lanceolate, equal, ca. 3.5 × 2 mm, apex acuminate or acute;
petals erect or erect basally and divergent distally, connate basally, yellow, narrowly lanceolate, carinate, ca. 10.5 mm, apex aristate;
filaments yellowish or greenish;
anthers yellow;
nectar scales yellow, subquadrate to spatulate or 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, connate basally, light brown or yellow.
spreading, distinct, tan to reddish.
= 24.
= 28.
Sedum oreganum
Sedum robertsianum
Varieties 2 (2 in the flora).
(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.)
1. Nectar scales subquadrate to spatulate, 0.4-0.5 mm; carpels 4.7-5.1 mm. | var. oreganum |
1. Nectar scales oblong, 0.5 mm; carpels 3.7-4.5 mm. | var. tenue |
BC
OR
WA
CalFlora
Flora NW
PNW Herbaria
WildflowerSearch
iNaturalist
USDA Plants Database
