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MONTIACEAE MINER'S LETTUCE FAMILY

John M. Miller, except as noted

Annual to perennial herb; generally fleshy. Stem: 1–many, generally glabrous. Leaf: simple, alternate or opposite. Inflorescence: axillary or terminal; cyme, raceme, panicle, umbel, or flower 1. Flower: bisexual, radial; sepals generally 2(9), free; petals (1)2–19, free or ± fused; stamens 1–many, epipetalous or not, anthers pink, rose, or yellow; ovary superior, chamber 1, ovules 1–many, placenta basal or free-central; styles (0)1–8, generally fused at base, branched. Fruit: capsule, circumscissile or 2–3-valved. Seed: 1–many, shiny or ± pebbly or sculptured, black or gray, generally with oil-filled appendage as food for ants.
± 22 genera, ± 230 species: generally temperate America, Asia, Australia, Europe, Kerguelen Is, New Zealand, southern Africa, poorly represented in Europe; some cultivated (Lewisia, Calandrinia). [Ogburn & Edwards 2009 Amer J Bot 96:391–408] Details of flowers, seeds require 20× magnification. —Scientific Editor: Thomas J. Rosatti.
Unabridged references: [Applequist et al. 2006 Syst Bot 31:310–319; Nyffeler et al. 2008 Haseltonia 14: 26–36]
Unabridged note: May include Hectorellaceae.

Key to Montiaceae

MONTIA

John M. Miller & Kenton L. Chambers

Annual, perennial herb, glabrous, ± fleshy, ± aquatic or not, matted or not. Leaf: cauline > 2, alternate or opposite, free, entire. Inflorescence: raceme, 1-sided; lowest flower generally bracted; pedicel recurved, erect in fruit. Flower: petals (3)5, equal or 2 larger, white to pink; stamens (3)5, epipetalous; ovary chamber 1, placentas basal, style 1, stigmas 3. Fruit: valves 3, margins rolled in, forcibly expelling seeds. Seed: 1–3, generally black, smooth to tubercled, appendaged or not.
12 species: Worldwide. (Giuseppe Monti, Italian botanist, 1682–1760) [Heenan 2007 New Zealand J Bot 45:437–439] Sometimes divided into 9 genera.
Unabridged references: [Miller 2003 FNANM 4:485–488; Moore 1963 Bot Not 116:16–30]

Key to Montia

M. howellii S. Watson HOWELL'S MONTIA
NATIVE
Annual 1–9 cm, matted, rooting at lower nodes. Leaf: alternate, 5–25 mm, linear or ± oblanceolate. Inflorescence: few to many, in axils of membranous bracts opposite stem leaves, sessile; flowers 2–6, lowest 1 bracted. Flower: generally cleistogamous; sepals 0.8–1.5 mm, widely ovate, obtuse; petals 0–0.7 mm, ± unequal, white; stamens 3. Fruit: 0.9–1.2 mm. Seed: 0.7–0.9 mm, smooth; appendage << 0.2 mm.
Vernally wet sites, often compacted soil; < 400 m. Northwestern California; to British Columbia. Sometimes mistaken for Montia fontana or Montia dichotoma. Self-pollinated. Mar–May [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 Sep 2 2014
Citation for this treatment: [Author of taxon treatment] 2013. Montia, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=33997, accessed on Sep 2 2014

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click for enlargement Montia howellii
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2004 Dean Wm. Taylor

Geographic subdivisions indicated for the distribution of Montia howellii 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.