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MALVACEAE MALLOW FAMILY

Steven R. Hill, except as noted

Annual to tree; generally with stellate hairs, often with bristles or peltate scales; juice generally mucilage-like; bark fibrous. Leaf: generally cauline, alternate, petioled, simple [palmate-compound], generally palmate-lobed and/or veined, generally toothed, evergreen or not; stipules persistent or not. Inflorescence: head, spike, raceme, or panicle, in panicle or not (a compound panicle), or flowers >= 1 in leaf axils, or flowers generally 1 opposite a leaf or on a spur; bracts leaf-like or not; bractlets 0 or on flowering stalks, often closely subtending calyx, generally in involucel. Flower: generally bisexual, radial; sepals 5, generally fused at base, abutting in bud, larger in fruit or not, nectaries as tufts of glandular hairs at base; petals (0)5, free from each other but generally fused at base to, falling with filament tube, clawed or not; stamens 5–many, filaments fused for most of length into tube around style, staminodes 5, alternate stamens, or generally 0; pistil 1, ovary superior, stalked or generally not, chambers generally >= 5, styles or style branches, stigmas generally 1 or 1–2 × chamber number. Fruit: loculicidal capsule, [berry], or 5–many, disk- or wedge-shaped segments (= mericarps).
266 genera, 4025 species: worldwide, especially warm regions; some cultivated (e.g., Abelmoschus okra; Alcea hollyhock; Gossypium cotton; Hibiscus hibiscus). [Angiosperm Phylogeny Group 1998 Ann Missouri Bot Gard 85:531–553] Recently treated to include Bombacaceae, Sterculiaceae, Tiliaceae. Mature fruit needed for identification; "outer edges" are surfaces between sides and back (abaxial surface) of segment. "Flower stalk" used instead of "pedicel", "peduncle", especially where both needed (i.e., when flowers both 1 in leaf axils and otherwise). —Scientific Editors: Steven R. Hill, Thomas J. Rosatti.
Unabridged references: [Alverson et al. 1999 Amer J Bot 86:1474–1486; Bayer et al. 1999 Bot J Linn Soc 129:267–303; Hill 2009 Madroño 56:104–111]

Key to Malvaceae

HORSFORDIA

John C. La Duke

[Subshrub], shrub, densely stellate-tomentose or -scabrous. Stem: erect. Leaf: petiole stout; blade lanceolate to ± round or cordate, ± entire or irregularly fine-toothed; stipules 2–5 mm. Inflorescence: axillary racemes clustered terminally or flowers 1 in leaf axils [panicle]; bractlets 0. Flower: petals white, yellow, blue-lavender, rose, or pink; anthers at tip of filament tube; styles 6–11, > anthers, stigmas head-like. Fruit: ± glabrous; segments 6–12, below indehiscent, firm, net-veined, above dehiscent, with 2 spreading, scarious wings. Seed: 1–3 per segment, puberulent or minutely ridged.
4 species: southwestern United States, northwestern Mexico. (F.H. Horsford, Vermont botanist, collector, 1855–1923)
Unabridged references: [Fryxell 1985 Syst Bot 10:268–272; Fryxell 1988 Syst Bot Monogr 25:234–240]

Key to Horsfordia

H. alata (S. Watson) A. Gray PINK VELVET-MALLOW
NATIVE
Stem: 1–2.5(4) m, gray-yellow. Leaf: petioles << blade; blade 4–11 cm, ovate, finely toothed, base ± cordate, tip acute. Inflorescence: flowering stalks 2–17 mm. Flower: calyx 5–7 mm, lobed 1/2; styles 9–10. Fruit: 7–8 mm diam, generally ± purple on top, segments 9–10, lower part 1-seeded, upper generally with 2 aborted ovules; wings ± 6 mm, 3 mm wide. Seed: 1 per segment, dark brown.
2n=30. Rocky canyons, washes; generally 100–600 m. Sonoran Desert; southwestern Arizona, northwestern Mexico. Dec–Apr [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 Apr 23 2014
Citation for this treatment: [Author of taxon treatment] 2012. Horsfordia, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=28428, accessed on Apr 23 2014

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Bioregions in which Horsfordia alata occurs 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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CCH collections by month

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