Jepson eFlora: Taxon page
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Thamnosma montana

Higher Taxonomy
Family: RutaceaeView DescriptionDichotomous Key

Common Name: RUE FAMILY
Habit: Perennial herb, shrub, tree, strongly aromatic, occasionally thorny. Leaf: generally alternate, simple or compound, dotted with minute, translucent glands; stipules 0. Inflorescence: cyme, raceme, or flowers 1, generally bracted. Flower: generally bisexual; sepals, petals each 4 or 5, free or fused at base; sepals generally persistent; petals generally +- white or +- green; stamens generally 2--4 × petal number; ovary superior, generally lobed, chambers 1--5, ovules 1--several per chamber. Fruit: berry, drupe, winged achene, or capsule. Seed: generally oily.
Genera In Family: +- 158 genera, +- 1900 species: especially tropics, warm temperate, especially southern Africa, Australia; used or cultivated for food (Citrus, 20--25 species), perfume, medicine, timber, ornamental (Choisya, Skimmia, etc). Toxicity: Some TOXIC: oils may cause sunburn or dermatitis.
eFlora Treatment Author: Lindsay P. Woodruff & James R. Shevock, except as noted
Scientific Editor: Douglas H. Goldman, Bruce G. Baldwin.
Genus: ThamnosmaView Description 

Habit: Subshrub or shrub. Leaf: simple or divided into 3 segments, alternate, minute, seasonally deciduous. Inflorescence: panicle (raceme-like or flowers scattered along stems). Flower: bisexual; sepals 4, fused at base, persistent; petals 4, erect in flower; stamens 8, in 2 series; ovary stalked or sessile, 2-lobed, style thread-like. Fruit: capsule, opening at tip, 2-lobed, leathery. Seed: 1--11 per chamber, +- smooth or tubercled.
Species In Genus: 12 species: southwestern United States, northern Mexico, southern Arabia to southern Africa. Etymology: (Greek: bush odor)
eFlora Treatment Author: Lindsay P. Woodruff

Thamnosma montana Torr. & Frém.
Stem: 3--6 dm, broom-like, +- yellow-green, densely gland-dotted, generally leafless. Leaf: simple, 0.5--1.5 cm. Flower: sepals +- 2 mm, ovate, +- green; petals 8--12 mm, elliptic, dark purple, tips reflexed; ovary stalked, ovules 3--8 per chamber, style well-exserted. Fruit: lobes +- 5 mm wide, +- spheric. Seed: 1--4 per chamber, +- 4 mm, reniform, +- smooth, +- brown.
Ecology: Dry slopes, washes, mesa tops; Elevation: < 2100 m. Bioregional Distribution: PR, D; Distribution Outside California: to Utah, Arizona, Mexico. Flowering Time: Feb--May
eFlora Treatment Author: Lindsay P. Woodruff
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botanical illustration including Thamnosma montana


Citation for this treatment: Lindsay P. Woodruff 2016. Thamnosma montana, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on April 30, 2016.

Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora,, accessed on April 30, 2016.

Thamnosma montana
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© 2016 Steve Matson
Thamnosma montana
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© 2008 Neal Kramer
Thamnosma montana
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© 1998 Larry Blakely
Thamnosma montana
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© 2012 Keir Morse
Thamnosma montana
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© 2008 Aaron Schusteff
Thamnosma montana
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© 2012 Keir Morse

More photos of Thamnosma montana in CalPhotos

Geographic subdivisions for Thamnosma montana:
PR, D;
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.
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.