Flora of North America species comparison

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Juncus hemiendytus

Juncus

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

jonc, rush
Habit Herbs, annual, cespitose, 0.03–0.36 dm. Herbs, perennial or rarely annual, rhizomatous or cespitose.
Culms

to 5.

round or flattened in cross section.
Cataphylls

often present at culm base.
Leaves

to 1.8 cm, 1/2–1 1/3 height of plant.

sheaths open;

blade flat, channeled, ensiform or terete, sometimes septate, margins involute.
Inflorescences

solitary flowers.

terminal or pseudoaxillary, monochasia or dichasia, usually with monochasial branches, cymes or 1–many heads in racemes or panicles;

bracteoles 2 or absent.
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 (4–)6 in 2 whorls;

stamens (2–)3–6.
Capsules

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

1-locular or 3-locular, septicidal.
Seeds

ovoid to oblate, 0.3–0.55 mm.

many, ellipsoid to ovoid, sometimes tailed.

Juncus hemiendytus

Juncus
Distribution
from USDA
[WildflowerSearch map]
[BONAP county map]
from USDA
Worldwide except Antarctica
[BONAP county map]
Discussion

Varieties 2 (2 in the flora).

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

Species ca. 300 (95 in the flora).

(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
1. Flowers borne singly; bracteoles present (except J. pelocarpus, J. subtilis).
→ 2
1. Flowers in heads; bracteoles absent.
→ 4
2. Inflorescences appearing lateral, inflorescence bract terete, erect, appearing to be continuation of culm; basal leaves bladeless, cauline leaves absent
subg. Genuini
2. Inflorescences appearing terminal, inflorescence bract erect or ascending, flat, involute or terete; basal leaves (at least some) usually with blade, cauline leaves present or absent.
→ 3
3. Leaves terete, septate; capsules beaked
subg. Septati
3. Leaves flat, involute or terete, not septate; capsule rarely beaked
subg. Poiophylli
4. Leaves flat or ensiform.
→ 5
4. Leaves terete or compressed.
→ 6
5. Leaves ensiform, imperfectly septate
subg. Ensifolii
5. Leaves flat, not septate
subg. Graminifolii
6. Capsules large; seeds large, long tailed; leaves not noticeably septate
subg. Alpini
6. Capsules smaller; seeds not tailed or if tailed not long; leaves septate or not.
→ 7
7. Leaves not septate; plants halophytic
subg. Juncus
7. Leaves septate; plants usually of fresh water habitats
subg. Septati
Source FNA vol. 22, p. 232. FNA vol. 22. Authors: Ralph E. Brooks*, Steven E. Clemants*.
Parent taxa Juncaceae > Juncus > subg. Graminifolii Juncaceae
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
Subordinate taxa
J. hemiendytus var. abjectus, J. hemiendytus var. hemiendytus
J. subg. Alpini, J. subg. Ensifolii, J. subg. Genuini, J. subg. Graminifolii, J. subg. Juncus, J. subg. Poiophylli, J. subg. Septati
Synonyms J. brachystylus, J. brachystylus var. uniflorus, J. triformis var. uniflorus
Name authority F. J. Hermann: Leaflets of Western Botany 5: 118. (1948) Linnaeus: Sp. Pl. 1: 325. 1753; Gen. Pl. ed. 5; 152, (1754)
Web links 
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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