TREATMENT FROM THE JEPSON MANUAL	previous taxon | next taxon Jepson Interchange (more information)
	©Copyright 1993 by the Regents of the University of California Print edition is available from the University of California Press

	The second edition of The Jepson Manual (2012) is available from the University of California Press
	See also the Jepson eFlora, which parallels the Second Edition

JUNCACEAE

RUSH FAMILY

Janice Coffey Swab

Annual, perennial herb, generally from rhizomes
Stem round or flat
Leaves generally mostly basal; sheath margins fused, or overlapping and generally with 2 ear-like extensions at blade junction; blade round, flat, or vestigial, glabrous or margin hairy
Inflorescence: head-like clusters or single flowers, variously arranged; bracts subtending inflorescence 2, generally leaf-like; bracts subtending inflorescence branches 1–2, reduced; bractlets subtending flowers generally 1–2, generally translucent
Flower generally bisexual, radial; sepals and petals similar, persistent, green to brown or purplish black; stamens generally 3 or 6, anthers linear, persistent; pistil 1, ovary superior, chambers generally 1 or 3, placentas 1 and basal or 3 and axile or parietal, stigmas generally > style
Fruit: capsule, loculicidal
Seeds 3–many, often with white appendages on 1 or both ends
Genera in family: 9 genera, 325 species: temp, arctic, tropical mtns. Fls late spring to early fall.

JUNCUS

RUSH

Annual, perennial herb; rhizome (if any) generally with scale-like leaves
Stem generally cylindric or flat
Leaf: blade well developed and cylindric or flat, or reduced to small point; crosswalls often present (pull fresh blade apart lengthwise to see or slide leaf between fingers to feel); appendages often present at blade-sheath junction
Inflorescence generally terminal (appearing lateral when pushed aside by lowest inflorescence bract); bractlets 0–2
Flowers: stamens generally 3 or 6 (2 in some very small annual taxa); pistil 1, ovary chambers 1 or 3, placentas axile or parietal, stigmas generally 3(2)
Seeds many
Species in genus: 225 species: worldwide, especially n hemisphere
Etymology: (Latin: to join or bind, from use of stems)
Reference: [Ertter 1986 Mem NY Bot Gard 39:1–90]

Native

J. balticus Willd.

Perennial 35–110 cm; rhizome scaly, creeping, generally unbranched, slender to stout
Stem 1–6 mm wide, generally cylindric
Leaves basal; blades 0; sheaths variable, 2–15 cm
Inflorescence appearing lateral, ± open; lowest bract cylindric, resembling stem, generally >> inflorescence; flowers 5–50 or more; bractlets 2, membranous
Flower: perianth segments 3–6 mm, sepals ± = to > petals, scarious margins of petals wider than those of sepals; stamens 6, filaments << anthers
Fruit ± = perianth; beak small but obvious
Seed 0.4–0.8 mm; appendages 0
Chromosomes: 2n=40,80
Ecology: Moist to rather dry places
Elevation: generally < 2200 m.
Bioregional distribution: California
Distribution outside California: to Alaska, e N.America, S.America, Eurasia
Flowering time: May–Aug
Synonyms: var. montanus Engelm
Highly variable, intergrading complex needing study
Horticultural information: IRR, DRN: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24; also STBL; INV.