| 1 |
Inflorescences dense, spikelike, though often interrupted, nodding |
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9 Luzula spicata |
| + |
Inflorescences of distinct glomerules, not spikelike, sometimes lax but not nodding. |
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(2) |
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| 2 (1) |
Inflorescences of sessile glomerules only or with smaller glomerules on short branches. |
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(3) |
| + |
Inflorescences with central glomerule(s) sessile or nearly sessile, always with other pedunculate glomerules. |
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(8) |
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| 3 (2) |
Proximal inflorescence bract conspicuous, usually well-exceeding inflorescence. |
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(4) |
| + |
Proximal inflorescence bract inconspicuous. |
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(7) |
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| 4 (3) |
Seeds 1.3 mm, caruncle absent. |
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10 Luzula subcapitata |
| + |
Seeds 0.8--1.5 mm, with caruncle. |
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(5) |
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| 5 (4) |
Seeds 0.8 mm, caruncle 0.2 mm |
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11 Luzula orestera |
| + |
Seeds 0.9--1.5 mm, caruncle either barely visible or at least 0.3 mm. |
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(6) |
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| 6 (5) |
Capsules ovoid; caruncle barely visible. |
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12 Luzula groenlandica |
| + |
Capsules spheric; caruncle 0.3-0.8 mm |
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13 Luzula comosa |
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| 7 (3) |
Tepals shorter than capsule; bracteoles deep brown, dentate |
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14 Luzula nivalis |
| + |
Tepals and capsule about equal; bracteoles clear to deep brown, conspicuously fimbriate |
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15 Luzula confusa |
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| 8 (2) |
Inflorescence branches straight. |
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(9) |
| + |
Inflorescence branches arching. |
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(14) |
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| 9 (8) |
Inflorescence branches mostly erect; glomerules mostly cylindric. |
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(10) |
| + |
Inflorescence branches divergent as much as 90°; glomerules not cylindric. |
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(12) |
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| 10 (9) |
Tepals pale or with brown central area at maturity; seeds 0.7--1 mm; caruncle 0.2--0.3 mm |
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16 Luzula pallidula |
| + |
Tepals pale brown to chestnut brown to blackish at maturity; seeds 0.9--1.7 mm; caruncle 0.2--0.7 mm. |
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(11) |
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| 11 (10) |
Seeds 1.1--1.7 mm; caruncle 0.2--0.6 mm |
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17 Luzula multiflora |
| + |
Seeds 0.9--1.3 mm; caruncle 0.5--0.7 mm |
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18 Luzula bulbosa |
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| 12 (9) |
Leaves with callous apex; glomerules sessile to congested to spreading. |
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(13) |
| + |
Leaves without callous apex, glomerules on elongate peduncles |
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20 Luzula echinata |
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| 13 (12) |
Stolons slender and short, conspicuous rhizomes present |
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19 Luzula campestris |
| + |
Stolons or conspicuous rhizomes absent. |
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13 Luzula comosa |
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| 14 (8) |
Inflorescence branches arching in all directions; basal leaf sheaths bluish green |
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23 Luzula subcongesta |
| + |
Inflorescence branches arching in 1 direction; basal leaf sheaths variously colored. |
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(15) |
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| 15 (14) |
Basal leaf sheaths dull brown-gray to green; cauline leaves as large or larger than basal leaves |
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22 Luzula kjellmaniana |
| + |
Basal leaf sheaths shining reddish to brown to purple; cauline leaves usually smaller than basal leaves. |
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(16) |
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| 16 (15) |
Basal and cauline leaves not reaching inflorescence |
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21a subsp. unalaschkensis |
| + |
Basal and especially cauline leaves often reaching or exceeding inflorescence |
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15 Luzula confusa |
