| 1 |
Plants annual |
|
29 Juncus bufonius |
| + |
Plants perennial. |
|
(2) |
| |
|
|
|
| 2 (1) |
Leaves minutely serrulate; auricles deeply lacerate |
|
12 Juncus trifidus |
| + |
Leaves entire; auricles not lacerate. |
|
(3) |
| |
|
|
|
| 3 (2) |
Auricles at summit of leaf sheath 3--6 mm, membranous, transparent; capsules never 3-locular. |
|
(4) |
| + |
Auricles absent or merely short, scarious or cartilaginous projections less than 2 mm. |
|
(5) |
| |
|
|
|
| 4 (3) |
Capsules less than 3/4 length of tepals, borne widely spaced along usually diffuse branches of inflorescence; plants mostly 7--9 dm |
|
25 Juncus anthelatus |
| + |
Capsules 3/4 or more length of tepals, borne congested or branch internodes ca. as long as tepals; plants mostly less than 7 dm |
|
24 Juncus tenuis |
| |
|
|
|
| 5 (3) |
Leaf blade channeled to terete. |
|
(6) |
| + |
Leaf blade flat. |
|
(10) |
| |
|
|
|
| 6 (5) |
Inflorescence falsely lateral, overtopped by terete bract that looks to be continuation of culm |
|
16 Juncus coriaceus |
| + |
Inflorescence terminal, involucre bract flat or much shorter than inflorescence. |
|
(7) |
| |
|
|
|
| 7 (6) |
Perianth segments obtuse |
|
13 Juncus squarrosus |
| + |
Perianth segments acute to acuminate. |
|
(8) |
| |
|
|
|
| 8 (7) |
Seeds distinctly tailed, tail at least 1/2 length of seed body; capsules golden tan |
|
17 Juncus vaseyi |
| + |
Seeds not tailed; capsules chestnut brown or paler. |
|
(9) |
| |
|
|
|
| 9 (8) |
Capsules 1-locular or pseudo-3-locular, widely elliptic to rounded, apex rounded; seeds 0.3--0.4 mm |
|
23 Juncus dichotomus |
| + |
Capsules 3-locular, elliptic, apex somewhat truncate; seeds 0.48--0.7 mm |
|
18 Juncus greenei |
| |
|
|
|
| 10 (5) |
Capsules chestnust brown or darker; tepals apically obtuse or rounded. |
|
(11) |
| + |
Capsules tan or light brown; tepals acute to acuminate. |
|
(12) |
| |
|
|
|
| 11 (10) |
Anther 1--2 times length of filament, less than 1 mm; capsule usually exceeding perianth |
|
114 Juncus compressus |
| + |
Anther 2--4 times length of filament, longer than 1 mm; capsule usually nearly equal to perianth |
|
15 Juncus gerardii |
| |
|
|
|
| 12 (10) |
Capsules 3-locular. |
|
(13) |
| + |
Capsules 3-locular or pseudo-3-locular. |
|
(16) |
| |
|
|
|
| 13 (12) |
Tepals 2.5--3.5 mm; capsule nearly globose. |
|
(14) |
| + |
Tepals 4--5.5 mm; capsule ellipsoid to narrowly so. |
|
(15) |
| |
|
|
|
| 14 (13) |
Tepals green; flowers chiefly arranged along inner side of branches; plants of e North America |
|
22 Juncus secundus |
| + |
Tepals usually with brownish midstripe; flowers not secund; plants of w North America |
|
20 Juncus confusus |
| |
|
|
|
| 15 (13) |
Anthers 0.6--0.9 mm; auricles scarious, lobes 0.5 mm; plants of c United States |
|
19 Juncus brachyphyllus |
| + |
Anthers 1.2--1.5 mm; auricles scarious to membranous, 0.2--0.3 mm; plants endemic to s Appalachian Piedmont |
|
21 Juncus georgianus |
| |
|
|
|
| 16 (12) |
Auricles 0.5--1(--1.5) mm, membranous |
|
26 Juncus occidentalis |
| + |
Auricles 0.1--0.3(--1) mm, scarious to leathery. |
|
(17) |
| |
|
|
|
| 17 (16) |
Auricles leathery, yellowish; tepals spreading in fruit, nearly equal to or exceeding capsule; anthers 0.6--1 mm |
|
28 Juncus dudleyi |
| + |
Auricles scarious, whitish or sometimes purplish tinged, not leathery; anthers 0.4--0.6 mm. |
|
(18) |
| |
|
|
|
| 18 (17) |
Mature capsules light brown or darker; plants of coastal plain of e, se North America |
|
23 Juncus dichotomus |
| + |
Mature capsules light tan; plants of interior continent |
|
27 Juncus interior |
