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CRASSULACEAE STONECROP FAMILY

Steve Boyd, except as noted

Annual to shrub [(± tree-like or climbing)], fleshy. Leaf: generally simple, alternate or opposite, in dense to open, basal (or terminal) rosettes or basal and cauline, not in rosettes, reduced distally or not, margin often ± red. Inflorescence: generally cyme, generally bracted. Flower: generally bisexual; sepals generally 3–5, generally ± free; petals generally 3–5, ± free or fused; stamens >> to = sepals, epipetalous or not; pistils generally 3–5, simple, fused at base or not, ovary 1-chambered, placenta 1, parietal, ovules 1–many, style 1. Fruit: follicles, generally 3–5. Seed: 1–many, small.
± 33 genera, ± 1400 species: ± worldwide, especially dry temperate; many cultivated for ornamental. [Eggli (ed.) 2003 Illus Handbook Succulent Plants 6 (Crassulaceae). Springer] Water-stressed plants often ± brown or ± red. Consistent terminology regarding leaves, bracts difficult; in taxa with rosettes (e.g., Aeonium, Dudleya, some Sedum), structures in rosettes are leaves, those on peduncles are bracts, and those subtending flowers are flower bracts; in taxa where inflorescence is terminal, rosette leaves may "become" bracts as stem rapidly elongates to form inflorescence. Seed numbers given per follicle. —Scientific Editor: Thomas J. Rosatti.

Key to Crassulaceae

SEDUM STONECROP

Steve Boyd & Melinda F. Denton

Perennial herb (annual, biennial, subshrub), generally from rhizomes or stout, scaly caudex, generally glabrous; rosettes 0 or open to dense. Leaf: sessile, generally alternate, generally obovate to spoon-shaped. Inflorescence: terminal, generally raceme- to panicle-like. Flower: sepals, petals generally 5, free to fused at base, sepals < petals, obtuse to long-tapered; petals erect to spreading; stamens 8 or 10, in 2 whorls, epipetalous or not; pistils 4–5, free or fused below. Fruit: free or fused at base, erect or spreading. Seed: many, elliptic, often winged at both ends.
± 450 species: temps, tropical mountains, North America, Mexico, Central America, Europe, Asia, northern and eastern Africa, Atlantic islands, Indian Ocean islands; cultivated as ornamental, green roofs. (Latin: to assuage, from healing properties of houseleek, to which Sedum was sometimes applied) Sedum roseum moved to Rhodiola.
Unabridged references: [Denton 1982 Brittonia 34:48–77]

Key to Sedum

S. laxum (Britton) A. Berger
NATIVE
Plant 7–40 cm, glaucous or not; rosettes dense, 1–6 cm diam, internodes not visible, < 3 mm. Leaf: 9–50 mm, 1–5 mm thick, generally widest 3–8 mm below tip, tip rounded or ± notched. Inflorescence: 2–11 cm, 12–80-flowered, flat-topped or not; bracts 5–20 mm. Flower: sepals generally 1/3–2/3 petals, generally acute; petals 6–13 mm, obovate, obtuse or acute. Fruit: free, 6–12 mm, erect. Seed: 1–2 mm. [Online Interchange]

S. laxum subsp. heckneri (M. Peck) R.T. Clausen HECKNER'S STONECROP
NATIVE
Plant 9–24 cm. Leaf: 11–32 mm. Inflorescence: bract length < to > width, base cordate, clasping. Flower: petals obtuse, white to pink; anthers ± red-brown to purple-black.
n=15. Generally steep serpentine or gabbro outcrops; 100–1800 m. Klamath Ranges, n Outer North Coast Ranges; southwestern Oregon. [Sedum laxum var. heckneri (M. Peck) H. Ohba] May–Sep [Online Interchange] {CNPS list}

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Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on Oct 24 2014
Citation for this treatment: [Author of taxon treatment] 2013. Sedum, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=52929, accessed on Oct 24 2014

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Geographic subdivisions indicated for the distribution of Sedum laxum subsp. heckneri Markers link to CCH specimen records. If the markers are obscured, reload the page [or change window size and reload]. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues.
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map of distribution 1
(Note: any qualifiers in the taxon distribution description, such as 'northern', 'southern', 'adjacent' etc., are not reflected in the map above, and in some cases indication of a taxon in a subdivision is based on a single collection or author-verified occurence).

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Data provided by the participants of the Consortium of California Herbaria.
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CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa.
Blue line denotes eFlora flowering time.