Jepson eFlora: Taxon page
Vascular Plants of California
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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.
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
Jepson eFlora Author: Lindsay P. Woodruff
Index of California Plant Names (ICPN; linked via the Jepson Online Interchange)

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Botanical illustration including Thamnosma montana

botanical illustration including Thamnosma montana

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Citation for this treatment: Lindsay P. Woodruff 2012, Thamnosma montana, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on December 03, 2023.

Citation for the whole project: Jepson Flora Project (eds.) 2023, Jepson eFlora,, accessed on December 03, 2023.

Thamnosma montana
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©2016 Steve Matson
Thamnosma montana
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©2012 Keir Morse
Thamnosma montana
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©2008 Aaron Schusteff
Thamnosma montana
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©1998 Larry Blakely
Thamnosma montana
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©2009 Keir Morse

More photos of Thamnosma montana
in CalPhotos

Geographic subdivisions for Thamnosma montana:
1. You can change the display of the base map layer control box in the upper right-hand corner.
2. County and Jepson Region polygons can be turned off and on using the check boxes.
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).


Data provided by the participants of the  Consortium of California Herbaria.
View all CCH records
All markers link to CCH specimen records. The original determination is shown in the popup window.
Blue markers indicate specimens that map to one of the expected Jepson geographic subdivisions (see left map). Purple markers indicate specimens collected from a garden, greenhouse, or other non-wild location.
Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues.

CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa, if there are more than 1 infraspecific taxon in CA.
Blue line denotes eFlora flowering time (fruiting time in some monocot genera).