Jepson Flora Project: Jepson Interchange    

 
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  • Up-to-date information about California vascular plants is available from the Jepson eFlora.

ACACIA

Elizabeth McClintock

Tree, shrub, armed or unarmed
Leaves even-2-pinnate or, if simple, true blades 0, petioles and midribs blade-like (comprising phyllodia), generally alternate, generally evergreen; axes with prominent raised glands or not
Inflorescence: heads, spheric, generally axillary, these solitary or in racemes or panicles, or flowers in spikes
Flower radial; sepals, petals inconspicuous; stamens many, conspicuous, exserted, free
Fruit generally dehiscent, sometimes tardily so, flat or ± cylindric
Species in genus: ± 1200 species: tropical, subtropical, especially Australia
Etymology: (Greek: sharp point)
Reference: [Whibley 1980 Acacias of South Australia; Clarke et al. 1989 Systematic Botany 14:549–564]
Australian species cultivated, sometimes naturalized and spreading in CA (seed arilled, stalk often elongated, encircing seed or not).

Native

T. albopurpureum Torr. & A. Gray

Annual, hairy
Stem decumbent to erect
Leaves cauline; stipules small; leaflets 1–3 cm, oblanceolate to obovate
Inflorescence: spike, 5–20 mm wide, ovoid to short-cylindric
Flower: calyx 4–15 mm, lobes > or >> tube, tapered or bristle-like, plumose; corolla < or > calyx, 2-colored (purple and white)
Seeds 1–2
Chromosomes: 2n=16,32
Ecology: Coastal dunes, grasslands, wet meadows, open slopes, oak chaparral, pine woodlands, roadsides, other disturbed places
Elevation: < 2100 m.
Bioregional distribution: California Floristic Province
Distribution outside California: to British Columbia, Baja California
Formidable complex here ± arbitrarily divided into 3 intergrading vars.; probably should including T. amoenum.

Native

T. monanthum A. Gray

Perennial, very small, often cespitose, glabrous or puberulent
Stem slender or reduced
Leaves generally basal; stipules lanceolate to ovate; leaflets 2–12 mm, elliptic-oblanceolate to widely obovate
Inflorescence: reduced head, included or exserted from leaves, 1–6-flowered; involucre vestigial or bracts 2–5, inconspicuous, ± free, 1–3 mm
Flower: calyx 4–5 mm, lobes ± = tube, bristle-tipped; corolla 7–12 mm, white or lavender-striate
Fruit sometimes rupturing corolla
Seeds 1–2
Chromosomes: 2n=16
Ecology: Pinyon pine belt upwards, mtn forests near streams, wet meadows with aspen or willows, coniferous woodlands
Elevation: 1500–3800 m.
Bioregional distribution: Cascade Range, Sierra Nevada, South Coast, San Gabriel Mountains, San Bernardino Mountains, San Jacinto Mountains, East of Sierra Nevada
Distribution outside California: Nevada

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