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Vascular Plants of California
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Subularia aquatica subsp. americana
WATER AWLWORT


Higher Taxonomy
Family: Brassicaceae (Cruciferae)View DescriptionDichotomous Key
Common Name: MUSTARD FAMILY
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: SubulariaView Description 


Common Name: AWLWORT
Habit: Annual, aquatic, scapose, hairs 0. Leaf: basal rosetted, sessile, erect, linear to narrowly awl-like, entire; cauline 0. Inflorescence: +- elongated. Flower: sepals erect to ascending, base not sac-like; petals white, not clawed. Fruit: silicle, dehiscent, obovoid to ellipsoid or oblong, +- flat perpendicular to septum; unsegmented; stigma entire. Seed: 4--18, in 2 rows, wingless.
Species In Genus: 2 species: northern hemisphere. Etymology: (Latin: awl, from leaf shape)
eFlora Treatment Author: Ihsan A. Al-Shehbaz
Reference: Mulligan & Calder 1964 Rhodora 66:127--135
Subularia aquatica L. subsp. americana G.A. Mulligan & Calder
NATIVE
Stem: (0.5)1.5--15(23) cm. Leaf: (0.5)1--7(10) cm, narrowly awl-like. Flower: sepals (0.5)0.7--1(1.3) mm; petals 1.2--1.5 mm, 0.2--0.5 mm wide. Fruit: (1.5)2--3.5(5.5) mm, 1.2--2(2.5) mm wide, obovoid to wide-ellipsoid; pedicels ascending to erect, 1--7(10) mm, straight. Seed: (4)6--12(18), 0.8--1 mm, oblong.
Ecology: Shallow lake margins, streambanks, wet sedge meadows, muddy flats, salt marshes; Elevation: 1800--3200 m. Bioregional Distribution: SNH; Distribution Outside California: to Alaska, Canada, northeastern United States. Flowering Time: Jul--Oct Note: Other subsp. native to northern Eurasia.
Synonyms: Subularia aquatica var. americana (G.A. Mulligan & Calder) Boivin
Jepson eFlora Author: Ihsan A. Al-Shehbaz
Reference: Mulligan & Calder 1964 Rhodora 66:127--135
Index of California Plant Names (ICPN; linked via the Jepson Online Interchange)
Listed on CNPS Rare Plant Inventory

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Botanical illustration including Subularia aquatica subsp. americana

botanical illustration including Subularia aquatica subsp. americana

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Citation for this treatment: Ihsan A. Al-Shehbaz 2012, Subularia aquatica subsp. americana, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/eflora/eflora_display.php?tid=53160, accessed on December 14, 2019.

Citation for the whole project: Jepson Flora Project (eds.) 2019, Jepson eFlora, http://ucjeps.berkeley.edu/eflora/, accessed on December 14, 2019.

Subularia aquatica subsp. americana
click for enlargement
© 2008 Steve Matson
Subularia aquatica subsp. americana
click for enlargement
© 2008 Steve Matson
Subularia aquatica subsp. americana
click for enlargement
© 2008 Steve Matson
Subularia aquatica subsp. americana
click for enlargement
© 2008 Steve Matson
Subularia aquatica subsp. americana
click for enlargement
© 2008 Steve Matson

More photos of Subularia aquatica subsp. americana in CalPhotos



Geographic subdivisions for Subularia aquatica subsp. americana:
SNH
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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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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.