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Oregon stonecrop

dwarf stonecrop

Habit Herbs, perennial, multi-stemmed from base, glabrous. Herbs, perennial, mat-forming, glabrous.
Stems

rootstocks and decumbent branches, (stout), bearing terminal rosettes.

procumbent, becoming erect, (reddish-shiny proximally), long-branched, not bearing rosettes.

Flowering shoots

erect, simple or branched, 8–13 cm;

leaf blades spatulate or cuneate, base short-spurred;

offsets not formed.

erect, simple or branched, 2–4 cm;

leaf blades orbiculate to broadly ovate, base not spurred;

offsets not formed.

Leaves

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.

alternate, (densely set), erect to slightly spreading, sessile;

blade green with prominent red dots, not glaucous, sometimes waxy, orbiculate to broadly obovate, semiterete, 2.5–3.5(–5) × 2–2.5 mm, base not spurred, not scarious, apex rounded to acute.

Inflorescences

dense corymbs, 5–10-flowered, 3-branched;

branches spreading to erect, primary branch dichotomously forked;

bracts spatulate or oblanceolate, 5–8 mm, base spurred.

subscorpioid cymes, 10–20-flowered, simple to 2-branched;

branches erect to spreading or recurved, sometimes forked;

bracts oblong, ca. 3 mm, base broadly spurred.

Pedicels

absent or 0.4–3+ mm.

absent.

Flowers

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.

5-merous;

sepals suberect, distinct basally, greenish, sometimes with reddish striations, subovate, unequal, 2–2.5 × 0.1–1.6 mm, apex obtuse, (papillose);

petals erect to spreading, distinct, yellow with prominent, short, longitudinal red stripes, lanceolate, carinate, 4.5–5 mm, apex subobtuse, narrowly mucronate;

filaments whitish or pale yellow;

anthers yellow;

nectar scales inconspicuous.

Carpels

erect in fruit, connate basally, light brown or yellow.

spreading in fruit, distinct, tan or brown with reddish striations.

2n

= 24.

= 52, 53, 104.

Sedum oreganum

Sedum nanifolium

Phenology Flowering late spring–early winter.
Habitat Limestone gravel or outcrops in various vegetation
Elevation 1300-2000 m (4300-6600 ft)
Distribution
from FNA
AK; CA; OR; WA; BC
[WildflowerSearch map]
[BONAP county map]
from FNA
TX; Mexico (Chihuahua, Coahuila, Nuevo León)
Discussion

Varieties 2 (2 in the flora).

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Sedum nanifolium is found in the Del Norte Mountains of Brewster County. The long-branched (to 20 cm), reddish-shiny stems are distinctive; see discussion under 19. S. robertsianum.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Key
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
Source FNA vol. 8, p. 221. FNA vol. 8, p. 211.
Parent taxa Crassulaceae > Sedum Crassulaceae > Sedum
Sibling taxa
S. acre, S. albomarginatum, S. album, S. annuum, S. borschii, S. cockerellii, S. debile, S. divergens, S. glaucophyllum, S. havardii, S. hispanicum, S. lanceolatum, S. laxum, S. leibergii, S. lineare, S. mexicanum, S. moranii, S. nanifolium, S. nevii, S. niveum, S. nuttallii, S. oblanceolatum, S. obtusatum, S. ochroleucum, S. oregonense, S. praealtum, S. pulchellum, S. pusillum, S. radiatum, S. robertsianum, S. rupestre, S. rupicola, S. sarmentosum, S. sexangulare, S. spathulifolium, S. stelliforme, S. stenopetalum, S. ternatum, S. villosum, S. wrightii
S. acre, S. albomarginatum, S. album, S. annuum, S. borschii, S. cockerellii, S. debile, S. divergens, S. glaucophyllum, S. havardii, S. hispanicum, S. lanceolatum, S. laxum, S. leibergii, S. lineare, S. mexicanum, S. moranii, S. nevii, S. niveum, S. nuttallii, S. oblanceolatum, S. obtusatum, S. ochroleucum, S. oreganum, S. oregonense, S. praealtum, S. pulchellum, S. pusillum, S. radiatum, S. robertsianum, S. rupestre, S. rupicola, S. sarmentosum, S. sexangulare, S. spathulifolium, S. stelliforme, S. stenopetalum, S. ternatum, S. villosum, S. wrightii
Subordinate taxa
S. oreganum var. oreganum, S. oreganum var. tenue
Synonyms Gormania oregana S. parvum subsp. nanifolium
Name authority Nuttall: in J. Torrey and A. Gray, Fl. N. Amer. 1: 559. (1840) Fröderström: Acta Horti Gothob. 10(app.): 96, figs. 736–746, plate 61. (1936)
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