Jepson Flora Project: Jepson Interchange    

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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California
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Dieter H. Wilken, except as specified

Annual, perennial herb, sometimes aquatic
Leaves generally basal and cauline, generally alternate, simple or compound; petioles at base generally flat, sometimes sheathing or stipule-like
Inflorescence: cyme, raceme, panicle, or flowers solitary
Flower generally bisexual, radial; sepals generally 5, free, early deciduous or withering in fruit, generally green; petals 0–many, free; stamens generally 10–many; pistils 1–many, ovary superior, chamber 1, style 1, generally ± persistent in fruit as beak, ovules 1–many
Fruit: achene, follicle, berry, or utricle-like, 1–many-seeded
Genera in family: ± 60 genera, 1700 species: worldwide, especially n temp, tropical mtns; many ornamental (Adonis, Aquilegia, Clematis, Consolida, Delphinium, Erianthis, Helleborus ), some highly TOXIC (Aconitum, Actaea, Delphinium, Ranunculus )
Reference: [Duncan & Keener 1991 Phytologia 70:24–27]



Annual from fibrous roots, generally glabrous
Stems 1–many, ascending to erect, slender, generally tufted
Leaves simple; basal, ± sessile, thread-like to narrowly oblanceolate, entire
Inflorescence scapose; peduncle 1-flowered, in fruit generally > 1 cm
Flower bisexual, radial; receptacle in fruit much elongated, cylindric; sepals 5–7, spurred, white to green, fading brownish; petals 0 or 3–5, white to greenish or yellowish, generally early deciduous; stamens 5–many; pistils many
Fruit: achenes, glabrous to puberulent; keel on outer surface, in depression or not, beak (continuation of keel) ± ascending to erect-appressed
Species in genus: 10–15 species: temp Am, Eurasia, New Zealand
Etymology: (Greek: mouse tail, from receptacle in fruit)
Reference: [Campbell 1952 El Aliso 2:389–403; Stone 1959 Evolution 13:151–174]
Fr needed for identification.


M. sessilis S. Watson

Plant 1–10 cm
Leaf 1–7 cm, linear
Inflorescence in fruit < leaves; peduncle in fruit < 1 cm
Flower: receptacle in fruit 10–30 mm; sepals 1.5–2.5 mm, spur < 1 mm; petals 3–5, ± = sepals; stamens generally 5
Fruit ± compressed laterally; keel not in a depression; beak ± ascending, ± 1 mm
Ecology: Vernal pools, grassland
Elevation: < 150 m.
Bioregional distribution: Great Central Valley
Distribution outside California: s Oregon
Synonyms: M. minimus var. sessiliflorus (Huth) G.R. Campb
Sometimes confused with M. m.

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bioregional map for MYOSURUS%20sessilis being generated
YOU CAN HELP US make sure that our distributional information is correct and current. If you know that a plant occurs in a wild, reproducing state in a Jepson bioregion NOT highlighted on the map, please contact us with that information. Please realize that we cannot incorporate range extensions without access to a voucher specimen, which should (ultimately) be deposited in an herbarium. You can send the pressed, dried collection (with complete locality information indicated) to us (e-mail us for details) or refer us to an accessioned herbarium specimen. Non-occurrence of a plant in an indicated area is difficult to document, but we will especially value your input on those types of possible errors (see automatic conversion of distribution data to maps).

Retrieve Jepson Interchange Index to Plant Names entry for Myosurus sessilis
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