Jepson eFlora: Taxon page
Key to families | Table of families and genera
Previous taxon Index to accepted names and synonyms:
| A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z |
Next taxon
Myosurus sessilis

Higher Taxonomy
Family: RanunculaceaeView DescriptionDichotomous Key

Common Name: BUTTERCUP FAMILY
Habit: Annual, perennial herb, woody vine [shrub], occasionally aquatic. Leaf: generally basal and cauline, alternate or opposite, simple or compound; petioles at base generally flat, occasionally sheathing or stipule-like. Inflorescence: cyme, raceme, panicle, or flowers 1. Flower: generally bisexual, generally radial; sepals 3--6(20), free, early-deciduous or withering in fruit, generally green; petals 0--many, generally free; stamens generally 5--many, staminodes generally 0; pistils 1--many, ovary superior, chamber 1, style 0--1, generally +- persistent as beak, ovules 1--many. Fruit: achene, follicle, berry, +- utricle in Trautvetteria, in aggregate or not, 1--many-seeded.
Genera In Family: +- 60 genera, 1700 species: worldwide, especially northern temperate, tropical mountains; many ornamental (Adonis, Aquilegia, Clematis, Consolida, Delphinium, Helleborus, Nigella). Toxicity: some highly TOXIC (Aconitum, Actaea, Delphinium, Ranunculus). Note: Taxa of Isopyrum in TJM (1993) moved to Enemion; Kumlienia moved to Ranunculus.
eFlora Treatment Author: Margriet Wetherwax & Dieter H. Wilken, family description, key to genera
Scientific Editor: Douglas H. Goldman, Bruce G. Baldwin.
Genus: MyosurusView DescriptionDichotomous Key

Common Name: MOUSETAIL
Habit: Annual, short-lived, generally tufted. Leaf: basal, simple, linear. Inflorescence: scapose, 1-flowered. Flower: sepals (3)5(8), 1.5--4 mm, alike, free, green or scarious-margined, spurred; petals 0--5, free, linear to narrowly spoon-shaped, long-clawed, white; stamens 5--25; pistils 10--400, 1--2.5 mm, ovules 1, styles thread-like. Fruit: achene, angled, wall not veined, styles persistent, +- enlarged in fruit; receptacle elongate, generally growing and producing ovules after flower.
Species In Genus: +- 15 species: temperate worldwide. Etymology: (Greek: mus, mouse, and oura, tail)
eFlora Treatment Author: Alan T. Whittemore

Myosurus sessilis S. Watson
NATIVE
Habit: Plant 0.8--2.5 cm. Inflorescence: scape 0--0.2 cm. Flower: sepals +- 3-nerved, scarious margin wide. Fruit: outer face 1.2--2 mm, 0.4--0.8 mm wide, narrowly rhomboid, occasionally narrowly oblong, not bordered; beak 0.8--1.8 mm, diverging from fruit surface; aggregate 8--25 mm, 2--4 mm wide, included in leaves.
Ecology: Vernal pools, alkali flats; Elevation: 3--1600 m. Bioregional Distribution: GV; Distribution Outside California: Oregon. Flowering Time: Mar--May
Synonyms: Myosurus minimus L. var. sessiliflorus (Huth) G.R. Campb.
eFlora Treatment Author: Alan T. Whittemore
Jepson Online Interchange

Previous taxon: Myosurus minimus
Next taxon: Ranunculus

Name Search
botanical illustration including Myosurus sessilis

Contact/Feedback

Citation for this treatment: Alan T. Whittemore 2016. Myosurus sessilis, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=34226, accessed on February 12, 2016.

Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on February 12, 2016.


Myosurus sessilis
click for enlargement
© 2009 Barry Rice
Myosurus sessilis
click for enlargement
© 2009 Barry Rice
Myosurus sessilis
click for enlargement
© 2003 George W. Hartwell
Myosurus sessilis
click for enlargement
© 2003 George W. Hartwell

More photos of Myosurus sessilis in CalPhotos


Geographic subdivisions for Myosurus sessilis:
GV;
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.
READ ABOUT YELLOW FLAGS
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).

View elevation by latitude chart
Data provided by the participants of the Consortium of California Herbaria.
View all CCH records

CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa.
Blue line denotes eFlora flowering time.