| 1 |
Styles 3; capsule teeth 6. |
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(2) |
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Styles (4 or)5; capsule teeth (8 or)10. |
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(3) |
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| 2 (1) |
Leaves linear-lanceolate; petals obovate, longer than sepals; stamens 10 |
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1 C. cerastoides |
| + |
Leaves ovate-elliptic; petals ovate, shorter than sepals; stamens 5 |
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2 C. parvipetalum |
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| 3 (1) |
Plants up to 20 cm tall. |
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(4) |
| + |
Plants at least 15 cm tall. |
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(12) |
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| 4 (3) |
Leaves elliptic, oblong, ovate, or obovate-elliptic. |
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(5) |
| + |
Leaves linear-lanceolate, lanceolate, or ovate-lanceolate. |
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(8) |
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| 5 (4) |
Cyme densely clustered, headlike |
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3 C. glomeratum |
| + |
Cyme not as above. |
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(6) |
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| 6 (5) |
Stems ascending; pedicel 5--8 mm, usually nutant after anthesis |
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4 C. pusillum |
| + |
Stems erect; pedicel to 15 mm. |
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(7) |
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| 7 (6) |
Leaf apex obtuse; flowers sparse; sepals oblong, 4--5 mm |
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5 C. limprichtii |
| + |
Leaf apex acute; flowers dense; sepals oblong-lanceolate, 7--8 mm |
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6 C. thomsonii |
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| 8 (4) |
Leaves ovate-lanceolate. |
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(9) |
| + |
Leaves linear-lanceolate or lanceolate. |
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(10) |
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| 9 (8) |
Plants annual; leaves 1--3 cm × 2--5 mm; flowers borne in a lax dichasium; calyx strongly inflated in fruit; capsule conical-cylindric |
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7 C. dichotomum subsp. inflatum |
| + |
Plants perennial; leaves 1--2.5 cm × 3--10 mm; flower solitary; calyx not inflated in fruit; capsule cylindric |
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8 C. lithospermifolium |
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| 10 (8) |
Leaf apex obtuse; petals slightly shorter than or equaling sepals |
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9 C. szechuense |
| + |
Leaves apex acute; petals longer than sepals. |
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(11) |
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| 11 (10) |
Leaves 1.3--2 cm × 2--4 mm; petals ca. 0.5 cm |
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10 C. baischanense |
| + |
Leaves 0.5--1 cm × 1--2 mm; petals 1--1.3 cm |
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11 C. morrisonense |
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| 12 (3) |
Leaves ovate, oblong, or elliptic. |
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(13) |
| + |
Leaves linear-lanceolate, lanceolate, ovate-lanceolate, or oblanceolate. |
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(16) |
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| 13 (12) |
Plants stout, 40--100 cm tall; leaves 5--8 × 1.5--4 cm. |
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(14) |
| + |
Plants slender, 15--60 cm tall; leaves 1--4 × 0.3--1.5 cm. |
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(15) |
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| 14 (13) |
Leaves and bracts opposite |
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12 C. davuricum |
| + |
Leaves and bracts 3-verticillate |
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13 C. verticifolium |
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| 15 (13) |
Stems glabrescent; petals ca. 2 × as long as sepals |
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14 C. wilsonii |
| + |
Stems pilose and/or glandular pubescent; petals slightly shorter than or equaling sepals |
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15 C. fontanum |
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| 16 (12) |
Leave ovate-lanceolate or oblanceolate. |
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(17) |
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Leaves lanceolate or linear-lanceolate. |
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(18) |
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| 17 (16) |
Plants perennial; leaves ovate-lanceolate; sepals oblong-lanceolate, ca. 5 mm; petals oblong or obovate, apex bifid |
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16 C. furcatum |
| + |
Plants annual; leaves oblanceolate; sepals ovate, 2--3 mm; petals spatulate, apex entire |
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17 C. takasagomontanum |
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| 18 (16) |
Leaves lanceolate. |
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(19) |
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Leaves linear-lanceolate. |
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(20) |
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| 19 (18) |
Leaves 0.2--1 cm wide; sepals lanceolate; petal apex 2-lobed |
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18 C. falcatum |
| + |
Leaves 1--2 cm wide; sepals ovate-oblong; petal apex entire |
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19 C. pauciflorum |
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| 20 (18) |
Leaves 1--2.5 cm; petals apically 2-lobed for 1/4--1/3 their length |
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20 C. arvense subsp. strictum |
| + |
Leaves 3--8 cm; petals apically entire, retuse, or crenately 2-lobed. |
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(21) |
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| 21 (20) |
Petals spatulate, apex entire |
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21 C. subpilosum |
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Petals obovate, apex retuse or crenately 2-lobed. |
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(22) |
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| 22 (21) |
Leaves 3--5 cm × 3--6 mm; sepals lanceolate; petals slightly longer than sepals; capsule ca. 2 × as long as sepals |
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22 C. tianschanicum |
| + |
Leaves 4--8 cm × 5--15 mm; sepals ovate; petals 2--3 × as long as sepals; capsule 2.5--3 × as long as sepals |
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23 C. maximum |
