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| 1 |
Flowers solitary in apical leaf axils or in 2-sided spikes; bracts 2- or 4-ranked, all fertile |
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(2) |
| + |
Spikes 1-sided; bracts 4-ranked, each 2 fertile or sterile |
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(6) |
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| 2 (1) |
Flowers solitary in apical leaf axils. |
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1 R. axilliflora |
| + |
Flowers in axillary or terminal spikes |
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(3) |
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| 3 (2) |
Plants 6-10 cm tall; spikes globose or ovoid, 0.5-1 cm. |
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2 R. mina |
| + |
Plants more than 20 cm tall; spikes cylindric, 1-7 cm |
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(4) |
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| 4 (3) |
Bracts without hyaline margin. |
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3 R. densiflora |
| + |
Bracts with hyaline margin |
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(5) |
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| 5 (4) |
Bracteoles elliptic, ca. 1/2 as long as bracts. |
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4 R. chinensis |
| + |
Bracteoles ovate-lanceolate, as long as bracts. |
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5 R. stolonifera |
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| 6 (1) |
Bract margins not ciliate |
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(7) |
| + |
Bract margins ciliate |
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(8) |
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| 7 (6) |
Sterile and fertile bracts different in shape; fertile bracts oblong, ca. 0.7 cm, apex rounded. |
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6 R. guangxiensis |
| + |
Sterile and fertile bracts similar in shape; fertile bracts oblong to elliptic-oblong, ca. 1.5 cm, apex acute. |
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7 R. pinpienensis |
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| 8 (6) |
Fertile bracts circular, obovate, elliptic, obovate-elliptic, or sphenoid, apex rounded, obtuse, or emarginate |
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(9) |
| + |
Fertile bracts lanceolate-linear, oblong-lanceolate, lanceolate, ovate, or elliptic, apex acute, acuminate, or cuspidate |
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(12) |
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| 9 (8) |
Fertile bracts circular to obovate, apex rounded to obtuse to emarginate and mucronate. |
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8 R. pectinata |
| + |
Fertile bracts sphenoid, elliptic, obovate, or obovate-elliptic, apex rounded and not mucronate |
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(10) |
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| 10 (9) |
Fertile bracts sphenoid. |
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9 R. monetaria |
| + |
Fertile bracts elliptic, obovate-elliptic, or obovate |
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(11) |
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| 11 (10) |
Fertile bracts elliptic to obovate-elliptic. |
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10 R. longipes |
| + |
Fertile bracts obovate. |
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11 R. bisaccata |
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| 12 (8) |
Bracts abaxially gland-tipped pubescent. |
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12 R. pungens |
| + |
Bracts glabrous or non-glandular pubescent |
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(13) |
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| 13 (12) |
Fertile bracts elliptic, broader at middle |
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(14) |
| + |
Fertile bracts ovate to ovate-lanceolate to lanceolate-linear, broader at base |
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(15) |
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| 14 (13) |
Leaf blade pubescent abaxially. |
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13 R. napoensis |
| + |
Leaf blade glabrous on both surfaces. |
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14 R. yunnanensis |
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| 15 (13) |
Leaf blade glabrous. |
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15 R. taiwanensis |
| + |
Leaf blade pubescent along veins and ciliate on margin. |
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16 R. hirpex |
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