Flora of North America species comparison

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Juncus hemiendytus

Juncus supiniformis

blood rush, dwarf rush, Herman's dwarf rush, Hermann's dwarf rush, juncus hemiendytus

hair-leaf rush, hairy-leaf rush, spreading rush
Habit Herbs, annual, cespitose, 0.03–0.36 dm. Herbs, perennial, cespitose or matted, often decumbent, rooting at proximal nodes or floating, 0.3–5 dm.
Culms

to 5.

erect, decumbent and rooting at nodes, or floating, terete, 1–2 mm diam., smooth.
Cataphylls

0 or 1–2, straw-colored, apex acute.
Leaves

to 1.8 cm, 1/2–1 1/3 height of plant.

basal 1–3, cauline 1–4;

auricles 0.8–2.1 mm, apex rounded to acute, membranaceous;

blade terete, 3.7–15 cm × 0.4–1.3 mm, occasionally with filiform, flaccid, and floating leaves to 60 cm.
Inflorescences

solitary flowers.

terminal racemes of 2–9 heads, 2–10 cm, branches erect;

primary bract erect;

heads 2–12-flowered, obconic or rarely hemispheric, 4–13 mm diam.
Flowers

2-merous;

: tepals 4(–6), erect to recurved at maturity, reddish, 1.5–3 × 0.5–1.2 mm;

outer and outer series nearly equal, apex rounded to acute;

stamens 2(–3), filaments 0.5–1.4 mm, anthers 0.3–0.7 mm;

style 0.1–0.4 mm, stigma 2(–3), 0.3–1 mm.

tepals light brown or greenish to reddish brown, linear to narrowly lanceolate, apex acute to acuminate-subulate;

outer tepals (2.1–)2.8–4.9 mm;

inner tepals (2.1–)2.8–5.5 mm;

stamens 3 or 6, anthers 1/2–3/4 filament length.
Capsules

reddish, 2–- or 3-locular, obovoid to ellipsoid or oblate, 1.9–3.5 × 1–2 mm.

usually exserted, dark brown, 1-locular, ovoid to oblong, (3.2–)3.5–6.1 mm, apex acute to acuminate proximal to beak, valves separating at dehiscence.
Seeds

ovoid to oblate, 0.3–0.55 mm.

narrowly obovoid to obovoid, 0.6–0.7 mm, not tailed;

body clear yellow-brown..
n

= ca. 30, ca. 50–60, 2n = ca. 112.

Juncus hemiendytus

Juncus supiniformis
Phenology Fruiting mid summer–fall.
Habitat Pond, lake and river shores, marshes, bogs, and ditches
Elevation 0–1000 m (0–3300 ft)
Distribution
from USDA
[WildflowerSearch map]
[BONAP county map]
from FNA
AK; CA; OR; WA; BC
[WildflowerSearch map]
[BONAP county map]
Discussion

Varieties 2 (2 in the flora).

(Discussion copyrighted by Flora of North America; reprinted with permission.)

The northern California and southern Oregon populations (Juncus supiniformis in the strict sense) form long filiform leaves before flowering, are shorter, and have smaller flowers than the northern populations. Except for the filiform leaves, the variation in sizes appears to follow a rough latitudinal cline with the largest plants and largest flowers in Alaska.

Flowers of Juncus supiniformis often form bulbils.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Key
1. Bracts proximal to inflorescence, 1–2
var. hemiendytus
1. Bracts proximal to inflorescence absent
var. abjectus
Source FNA vol. 22, p. 232. FNA vol. 22.
Parent taxa Juncaceae > Juncus > subg. Graminifolii Juncaceae > Juncus > subg. Septati
Sibling taxa
J. acuminatus, J. acutiflorus, J. acutus, J. alpinoarticulatus, J. anthelatus, J. arcticus, J. articulatus, J. biglumis, J. bolanderi, J. brachycarpus, J. brachycephalus, J. brachyphyllus, J. brevicaudatus, J. bryoides, J. bufonius, J. bulbosus, J. caesariensis, J. canadensis, J. capillaris, J. capitatus, J. castaneus, J. chlorocephalus, J. compressus, J. confusus, J. cooperi, J. coriaceus, J. covillei, J. debilis, J. dichotomus, J. diffusissimus, J. drummondii, J. dubius, J. dudleyi, J. effusus, J. elliottii, J. ensifolius, J. falcatus, J. filiformis, J. filipendulus, J. georgianus, J. gerardii, J. greenei, J. gymnocarpus, J. hallii, J. howellii, J. inflexus, J. interior, J. kelloggii, J. leiospermus, J. lesueurii, J. longistylis, J. luciensis, J. macrandrus, J. macrophyllus, J. marginatus, J. maritimus, J. megacephalus, J. mertensianus, J. militaris, J. nevadensis, J. nodatus, J. nodosus, J. occidentalis, J. orthophyllus, J. oxymeris, J. parryi, J. patens, J. pelocarpus, J. pervetus, J. phaeocephalus, J. polycephalus, J. regelii, J. repens, J. roemerianus, J. scirpoides, J. secundus, J. squarrosus, J. stygius, J. subcaudatus, J. subtilis, J. supiniformis, J. tenuis, J. texanus, J. textilis, J. tiehmii, J. torreyi, J. trifidus, J. triformis, J. triglumis, J. trigonocarpus, J. uncialis, J. validus, J. vaseyi, J. xiphioides
J. acuminatus, J. acutiflorus, J. acutus, J. alpinoarticulatus, J. anthelatus, J. arcticus, J. articulatus, J. biglumis, J. bolanderi, J. brachycarpus, J. brachycephalus, J. brachyphyllus, J. brevicaudatus, J. bryoides, J. bufonius, J. bulbosus, J. caesariensis, J. canadensis, J. capillaris, J. capitatus, J. castaneus, J. chlorocephalus, J. compressus, J. confusus, J. cooperi, J. coriaceus, J. covillei, J. debilis, J. dichotomus, J. diffusissimus, J. drummondii, J. dubius, J. dudleyi, J. effusus, J. elliottii, J. ensifolius, J. falcatus, J. filiformis, J. filipendulus, J. georgianus, J. gerardii, J. greenei, J. gymnocarpus, J. hallii, J. hemiendytus, J. howellii, J. inflexus, J. interior, J. kelloggii, J. leiospermus, J. lesueurii, J. longistylis, J. luciensis, J. macrandrus, J. macrophyllus, J. marginatus, J. maritimus, J. megacephalus, J. mertensianus, J. militaris, J. nevadensis, J. nodatus, J. nodosus, J. occidentalis, J. orthophyllus, J. oxymeris, J. parryi, J. patens, J. pelocarpus, J. pervetus, J. phaeocephalus, J. polycephalus, J. regelii, J. repens, J. roemerianus, J. scirpoides, J. secundus, J. squarrosus, J. stygius, J. subcaudatus, J. subtilis, J. tenuis, J. texanus, J. textilis, J. tiehmii, J. torreyi, J. trifidus, J. triformis, J. triglumis, J. trigonocarpus, J. uncialis, J. validus, J. vaseyi, J. xiphioides
Subordinate taxa
J. hemiendytus var. abjectus, J. hemiendytus var. hemiendytus
Synonyms J. brachystylus, J. brachystylus var. uniflorus, J. triformis var. uniflorus J. oreganus, J. paucicapitatus
Name authority F. J. Hermann: Leaflets of Western Botany 5: 118. (1948) Engelmann
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Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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