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Key to families | Table of families and genera
Indexes to all accepted names and synonyms:
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Annual to tree, glandular or not. Leaf: simple to palmately or pinnately compound, generally alternate; stipules free to fused (0), persistent to deciduous. Inflorescence: cyme, raceme, panicle, cluster, or flowers 1; bractlets on pedicel ("pedicel bractlets") generally 0–3(many), subtended by bract or generally not. Flower: generally bisexual, radial; hypanthium free or fused to ovary, saucer- to funnel-shaped, subtending bractlets ("hypanthium bractlets") 0–5, alternate sepals; sepals generally 5; petals generally 5, free; stamens (0,1)5–many, anther pollen sacs generally 2; pistils (0)1–many, simple or compound, ovary superior to inferior, styles 1–5. Fruit: 1–many per flower, achene (fleshy-coated or not), follicle, drupe, or pome with generally papery core, occasionally drupe-like with 1–5 stones. Seed: generally 1–5 (per fruit, not per flower).
110 genera, ± 3000 species: worldwide, especially temperate; many cultivated for ornamental, fruit, especially Cotoneaster, Fragaria, Malus, Prunus, Pyracantha, Rosa, Rubus. [Potter et al. 2007 Plant Syst Evol 266:5–43] Number of teeth is per leaf or leaflet, not per side of leaf or leaflet, except in Drymocallis. —Scientific Editors: Daniel Potter, Thomas J. Rosatti.
Unabridged references: [Robertson 1974 J Arnold Arbor 55:303–332, 344–401, 611–662]
Key to Rosaceae
Shrub, ± hairy. Leaf: simple, alternate, toothed; stipules 0. Inflorescence: raceme or panicle, terminal, many-flowered, persistent; pedicels slender, bractlets 1–3, linear. Flower: hypanthium saucer-shaped, prominent nectary-disk below inner rim, bractlets 0; petals generally white; stamens 15–20; pistils 5, ovaries superior, 2-ovuled, hairs dense, bristle-like, persistent in fruit, style persistent, stigma ± 2-lobed. Fruit: achenes 5.
3–5 species: western North America, Central America, northern South America. (Greek: whole disk)
Plant 0.3–6 m. Stem: bark ± red, in age gray, shredding; twigs glabrous to hairy, occasionally glandular. Leaf: 0.3–8 cm, ovate to obovate, strong-veined abaxially, glabrous to hairy, occasionally glandular, teeth entire to compound; base truncate to wedge-shaped; petiole distinct or not. Inflorescence: 2–25 cm, 1.5–25 cm wide. Flower: hypanthium 3–5 mm wide; sepals 1–2 mm; petals 1.5–2 mm; style 1 mm. Fruit: achenes 1–1.5 mm, often with sessile glands. [Holodiscus saxicola A. Heller] Highly variable; varieties intergrade. [Online Interchange]Key to Holodiscus discolor
Unabridged note: Highly variable; varieties intergrade, especially. var. discolor and var. microphyllus. Intermediate plants from High Sierra Nevada, East of Sierra Nevada, described as Holodiscus saxicola A. Heller, Holodiscus boursieri (Carrière) Rehder, do not merit taxonomic status.
Plant 0.3–1 m, ± dense. Stem: twigs hairy to long-hairy; glands 0 or obscured by hairs. Leaf: petiole generally indistinct; blade 0.3–3 cm, ± round to obovate, ± long-hairy on 1 or both surfaces, hairs not greatly longer on margins, veins, glands 0 or generally obscured by hairs, teeth entire, above middle, base generally wedge-shaped. Inflorescence: generally 2–8 cm, 1.5–5 cm wide; branches 0–few.
Rocky places, outcrops; 1100–4000 m. High Sierra Nevada, San Gabriel Mountains, San Bernardino Mountains, San Jacinto Mountains, East of Sierra Nevada, Desert Mountains; to Oregon, Idaho, Wyoming, Colorado, Arizona, Baja California. [Holodiscus microphyllus Rydb.; Holodiscus microphyllus Rydb. var. microphyllus] Jun–Sep [Online Interchange]
Previous taxon: Holodiscus discolor var. glabrescens
Next taxon: Horkelia
Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on Apr 17 2014
Citation for this treatment: [Author of taxon treatment] 2012. Holodiscus, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=91904, accessed on Apr 17 2014
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