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Vascular Plants of California
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Idahoa scapigera

Higher Taxonomy
Family: Brassicaceae (Cruciferae)View DescriptionDichotomous Key
Habit: Annual to shrub; sap pungent, watery. Leaf: generally simple, alternate; generally both basal, cauline; stipules 0. Inflorescence: generally raceme, generally not bracted. Flower: bisexual, generally radial; sepals 4, generally free; petals (0)4, forming a cross, generally white or yellow to purple; stamens generally 6 (2 or 4), 4 long, 2 short (3 pairs of unequal length); ovary 1, superior, generally 2-chambered with septum connecting 2 parietal placentas; style 1, stigma entire or 2-lobed. Fruit: capsule, generally 2-valved, "silique" (length >= 3 × width) or "silicle" (length < 3 × width), dehiscent by 2 valves or indehiscent, cylindric or flat parallel or perpendicular to septum, segmented or not. Seed: 1--many, in 1 or 2 rows per chamber, winged or wingless; embryo strongly curved.
Genera In Family: +- 330 genera, 3780 species: worldwide, especially temperate. Note: Highest diversity in Mediterranean area, mountains of southwestern Asia, adjacent central Asia, western North America; some Brassica species are oil or vegetable crops; Arabidopsis thaliana used in experimental molecular biology; many species are ornamentals, weeds. Aurinia saxatilis (L.) Desvaux in cultivation only. Aubrieta occasional waif in central NCoR, Carrichtera annua (L.) DC. in SCo, Iberis sempervirens L., Iberis umbellata L. in PR, Teesdalia coronopifolia (Bergeret) Thell., Teesdalia nudicaulis (L.) W.T. Aiton in southern NCoRO, CCo. Cardaria, Coronopus moved to Lepidium; Caulostramina to Hesperidanthus; Guillenia to Caulanthus; Heterodraba to Athysanus; California taxa of Lesquerella to Physaria; Malcolmia africana to Strigosella.
eFlora Treatment Author: Ihsan A. Al-Shehbaz, except as noted
Scientific Editor: Douglas H. Goldman, Bruce G. Baldwin.
Genus: IdahoaView Description 

Species In Genus: 1 sp. Etymology: (State of Idaho)
eFlora Treatment Author: Ihsan A. Al-Shehbaz
Idahoa scapigera (Hook.) A. Nelson & J.F. Macbr.
Habit: Annual, scapose, glabrous. Leaf: basal, rosetted, (3)7--20(25) mm, ovate, obovate to spoon-shaped, entire or lyre-shaped; petiole (0.2)0.5--2(3) cm. Inflorescence: peduncles many, (2)3--13 cm, 1-flowered, slender. Flower: sepals spreading to ascending, 1.5--1.8 mm, not sac-like at base; petals 2--2.5 mm, white. Fruit: silicle, flat parallel to septum, dehiscent, unsegmented, (5)6--9(10) mm, round to wide-ovate; style 0.3--0.8 mm, stigma entire; pedicel (1.5)2.5--11(13) cm. Seed: 6--10(12), in 2 rows, 3.5--5 mm wide; wing 0.8--1.2 mm wide. Chromosomes: 2n=16.
Ecology: Moist ledges, slopes, meadows, foothills; Elevation: 200--1700 m. Bioregional Distribution: NCoRI (Mount Saint Helena), CaR, n SN, s SNF, SnFrB (Mount Hamilton), SCoRI, GB; Distribution Outside California: to British Columbia, Montana. Flowering Time: Mar--May
Jepson eFlora Author: Ihsan A. Al-Shehbaz
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Botanical illustration including Idahoa scapigera

botanical illustration including Idahoa scapigera


Citation for this treatment: Ihsan A. Al-Shehbaz 2012, Idahoa scapigera, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on July 22, 2019.

Citation for the whole project: Jepson Flora Project (eds.) 2019, Jepson eFlora,, accessed on July 22, 2019.

Idahoa scapigera
click for enlargement
© 2008 Keir Morse
Idahoa scapigera
click for enlargement
© 2008 Keir Morse
Idahoa scapigera
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© 2011 Barry Breckling
Idahoa scapigera
click for enlargement
© 2011 Barry Breckling
Idahoa scapigera
click for enlargement
© 1998 John Game
Idahoa scapigera
click for enlargement
© 2008 Keir Morse

More photos of Idahoa scapigera in CalPhotos

Geographic subdivisions for Idahoa scapigera:
NCoRI (Mount Saint Helena), CaR, n SN, s SNF, SnFrB (Mount Hamilton), SCoRI, GB
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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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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.