Callitriche palustris

Callitriche palustris, the vernal water-starwort,^[3] narrow-fruited water-starwort,^[4] or spiny water starwort, is a species of aquatic plants. It is the type species of its genus.

Callitriche palustris
Water-starwort (Callitriche palustris) from Thomé Flora von Deutschland, Österreich und der Schweiz 1885
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Clade:	Asterids
Order:	Lamiales
Family:	Plantaginaceae
Genus:	Callitriche
Species:	C. palustris
Binomial name
Callitriche palustris L.[1]
Subspecies and varieties[2]
6; see text
Synonyms[2]
Callitriche androgyna L. (1755), nom. illeg. Callitriche fontana Scop. (1771), nom. superfl. Callitriche minima (L.) Hoppe (1792) Callitriche palustris var. minima L. (1753) Callitriche sessilis var. minima (L.) Mérat (1812) Callitriche verna var. fontana Rchb. (1832), nom. illeg. Callitriche verna f. fontana Soó (1928) Callitriche verna var. leptophylla Wimm. & Grab. (1827), nom. superfl. Callitriche verna subvar. minima (L.) Nyman (1879) Callitriche verna var. minima (L.) Hartm. (1820) Callitriche verna f. minima (L.) Beger (1924) Callitriche vernalis var. minima (L.) Lange (1887) Stellaria palustris (L.) Kuntze (1898), nom. illeg. Stellaria palustris f. minima (L.) Kuntze (1898)

It is native to temperate and subtropical North America and Eurasia, as well as Sumatra and Borneo.^[2]

Subspecies and varieties

Six subspecies and varieties are accepted.^[2]

• Callitriche palustris var. elegans (Petrov) Y.L.Chang (synonyms C. elegans Petrov, C. verna var. elegans (Petrov) Kitag., & C. verna subsp. elegans (Petrov) Kom. & Aliss.) – southeastern and northeastern China, Japan, Sakhalin, and East European Russia^[5]
• Callitriche palustris var. megalata Lansdown – Russian Far East (Primorye)
• Callitriche palustris var. oryzetorum (Petrov) Lansdown (synonym C. oryzetorum Petrov) – southern China, Taiwan, Japan, and western Himalayas^[6]
• Callitriche palustris subsp. palustris (synonyms Elatine alata Rostk. & Schmidt, C. alpina Schur, C. angustifolia Hoppe, C. aquatica Huds., C. bifida (L.) Morong, C. cespitosa Schultz, C. cuneifolia A.Braun ex Hegelm., C. euverna Syme, C. fallax Petrov, C. fissa Lej., C. intermedia Hoppe, C. latifolia Gilib. C. obtusangula subsp. alpina (Schur) Nyman, C. pallens Goldb., C. stellata Hoppe, C. stenocarpa Hegelm., C. tenuifolia Thuill. ex Pers., C. verna L., C. vernalis W.D.J.Koch, C. vernalis Kütz., Stellaria bifida (L.) Kuntze, and Stellaria verna (L.) F.H.Wigg.) – North America (except the southeastern US and Central America) and temperate Eurasia^[7]
• Callitriche palustris var. strumosa Lansdown – Borneo and Sumatra
• Callitriche palustris subsp. subanceps (Petrov) Kuvaev (synonyms C. anceps subsp. subanceps (Petrov) Á.Löve & D.Löve and C. subanceps Petrov) – eastern Siberia and Russian Far East^[8]