| 1 |
Plants annual. |
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(2) |
| + |
Plants perennial. |
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(11) |
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| 2 (1) |
Proximal bracts foliose, clearly surpassing inflorescence; outer tepals acute, 2 times as long as delicate obtuse inner tepals |
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49 Juncus capitatus |
| + |
All bracts commonly inconspicuous, membranous; inner and outer tepals similar in size and shape. |
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(3) |
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| 3 (2) |
Style and anthers more than 1 mm; culms to 13(--17) cm. |
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(4) |
| + |
Style and anthers less than 0.5(--0.8) mm; culms rarely to 6.5 cm. |
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(5) |
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| 4 (3) |
Culms capillary, 0.1--0.4 mm diam.; capsules usually shorter than perianth |
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40 Juncus triformis |
| + |
Culms stouter, (0.2--)0.4--0.8 mm diam.; capsules usually nearly equal to tepals |
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41 Juncus leiospermus |
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| 5 (3) |
Flowers mostly several per culm; bracts acute to acuminate. |
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(6) |
| + |
Flowers uniformly solitary; bracts acute to truncate or absent. |
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(9) |
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| 6 (5) |
Capsules usually shorter than perianth, greenish or tan |
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45 Juncus capillaris |
| + |
Capsules usually nearly equal to or longer than perianth, brownish. |
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(7) |
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| 7 (6) |
Flowers 2-merous; capsules longer than tepals |
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44 Juncus tiehmii |
| + |
Flowers usually 3-merous; capsules nearly equal to perianth. |
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(8) |
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| 8 (7) |
Flowers several per culm; capsules and tepals commonly turning dark reddish; seeds 0.4--0.5 mm |
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42 Juncus kelloggii |
| + |
Flowers solitary; capsules and tepals commonly remaining pale yellow-green until seeds ripen; seeds 0.3--0.4 mm |
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43 Juncus luciensis |
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| 9 (5) |
Tepals turning inward to enwrap shorter capsule at maturity, mostly less than 2.3 mm; flowers usually 3-merous; culms 0.1--0.2 mm diam. |
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46 Juncus bryoides |
| + |
Tepals erect to recurved at maturity, nearly equal to or shorter than capsule; flowers 2- or 3-trimerous; culms usually more than 0.2 mm diam. |
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(10) |
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| 10 (9) |
Flowers 3-merous; bracts solitary, truncate, completely sheathing culm |
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47 Juncus uncialis |
| + |
Flowers 2-merous; bracts 0--2, rounded to ovate, not sheathing culm |
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48 Juncus hemiendytus |
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| 11 (1) |
Culms arcuate-stoloniferous and creeping or floating |
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39 Juncus repens |
| + |
Culms erect, never rooting at nodes. |
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(12) |
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| 12 (12) |
Seeds not tailed. |
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(12) |
| + |
Seeds tailed. |
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(13) |
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| 13 (12) |
Auricles absent or essentially so; anthers 1--1.5 mm |
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32 Juncus regelii |
| + |
Auricles 1--3 mm, rounded to acutish; anthers 1.8--2.6 mm |
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33 Juncus howellii |
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| 14 |
Culms borne in tufts, rhizomes poorly developed. |
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(15) |
| + |
Culms borne singly or in small groups along creeping rhizome. |
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(17) |
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| 15 (14) |
Stamens 6 |
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34 Juncus macrophyllus |
| + |
Stamens 3. |
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(16) |
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| 16 (15) |
Tepals staw-colored; capsules yellowish to light brown; glomerules mostly 1--5(--10) per culm |
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37 Juncus filipendulus |
| + |
Tepals dark brown; capsules brown; glomerules more than 10 per culm |
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38 Juncus marginatus |
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| 17 (14) |
Stamens 3 |
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38 Juncus marginatus |
| + |
Stamens 6. |
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(18) |
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| 18 (17) |
Auricles absent or rudimentary, less than 1 mm. |
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(19) |
| + |
Auricles rounded or acute, 1--3 mm. |
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(21) |
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| 19 (18) |
Anthers 1.6--2.4 mm |
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31 Juncus orthophyllus |
| + |
Anthers 0.8--1.5 mm. |
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(20) |
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| 20 (19) |
Tepals 3--4 mm |
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36 Juncus covillei |
| + |
Tepals 4.5--6 mm |
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35 Juncus falcatus |
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| 21 (18) |
Tepals 3--4 mm |
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36 Juncus covillei |
| + |
Tepals 5--6 mm. |
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(22) |
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| 22 (21) |
Tepals with broad clear margins |
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30 Juncus longistylis |
| + |
Tepals without clear margins |
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31 Juncus orthophyllus |
