|
|
|
8. Cerastium L., Sp. Pl. 437. 1753. Gen. Pl. 585. 1754; Boiss., El. Or. 1:712. 1867; Edgew. & Hook. f. in Hook. f., Fl. Brit. Ind. 1: 227. 1874; Sell & Whitehead in Feddes Repert. 69, 14-24. 1964.
SHAHINA A. GHAZANFAR & YASIN J. NASIR
Annual or perennial herbs, often with glandular hairs. Leaves ovate to lanceolate, elliptic or obovate to oblong. Inflorescence of lax cymes or terminal cymose heads. Sepals 5, free, with scarious margins. Petals 5, bilobed at the apex. Stamens 10. Styles 3 or 5. Capsule cylindric, membranous, exserted from the calyx, dehiscing by twice the number of teeth as styles, teeth flat, revolute or with revolute margins. Seeds tuberculate.
A large cosmopolitan genus with 60 species. Represented in Pakistan by 8 species.
|
|
|
|
| 1 |
Styles 3. Capsule dehiscing by 6 teeth |
|
(2) |
| + |
Styles 5. Capsule dehiscing by 10 teeth |
|
(3) |
| |
|
|
|
| 2 (1) |
Plant with dichotomous or divaricate branching. Sepals 8-12 mm. Calyx somewhat inflated in fruit. Capsule teeth flat |
|
2 Cerastium dichotomum |
| + |
Plants with ± branched stems, neither dichotomous nor divaricate. Sepals 4-5 mm. Calyx not inflated in fruit. Capsule teeth revolute at apex |
|
1 Cerastium cerastioides |
| |
|
|
|
| 3 (1) |
Leaves stems and sepals white tomentose. Cultivated and occuring is an alien |
|
8 Cerastium tomentosum |
| + |
Leaves, stems and sepals not white tomentose |
|
(4) |
| |
|
|
|
| 4 (3) |
Leaves ovate to ovate-lanceolate, amplexicaule. Sepals 8-10 mm |
|
6 Cerastium dahuricum |
| + |
Leaves obovate or lanceolate or lanceolate-elliptic, sessile or with a short cuneate base.
Sepals less than 8 mm |
|
(5) |
| |
|
|
|
| 5 (4) |
Flowers in terminal cymose heads. Petals as long as or slightly shorter than the sepals. Pedicels usually shorter than the calyx |
|
3 Cerastium glomeratum |
| + |
Flowers in lax cymes. Petals 1½ times longer or shorter (C. fontanum subsp. trivale) than the
sepals. Pedicels usually longer than the calyx |
|
(6) |
| |
|
|
|
| 6 (5) |
Flowers 1-3. Capsule teeth flat |
|
7 Cerastium pusillum |
| + |
Flowers 3 or more in cymes. Capsule teeth with revolute margins |
|
(7) |
| |
|
|
|
| 7 (6) |
Sepals 6-8 mm. Petal 1½ times longer than sepals |
|
5 Cerastium thomsonii |
| + |
Sepals 4.5-5.5 mm. Petals shorter than the sepals |
|
4 Cerastium fontanum subsp. triviale |
|
|
|
Lower Taxa
Related Synonym(s):
| Related Links (opens in a new window) |
|
Treatments in Other Floras @ www.efloras.org
Other Databases
|
|
|
|
|
|
|
|
|
