|
|
|
2. Lemna L., Sp. Pl. 970. 1753. Gen. Pl. ed. 5: 417. 1754; Boiss., Fl. Or. 5: 29. 1884; Hook. f., Fl. Brit. Ind. 6: 556. 1894; Riedl in Rech. f., Fl. Iran. 119: 3. 1976; Landolt in Veroff. Geobot. Inst. ETH. 70: 17-19. 1980; Uotila in Davis, Fl. Turk. 8:65. 1984.
RIZWAN Y. HASHMI & SAOOD OMER
Fronds submerged or more usually, floating, in abundant number, solitary or in groups, oblong to ovate, asymmetrical or occasionally symmetrical, thin or spongy, 1-3 (-5)-veined, young thallus budding from the lateral pocket. Root solitary, one per frond, devoid of hairs, shortly sheathed near point of origin; sheath simple or winged laterally. Floral pocket lateral with spathe enclosing 2 staminate and one pistillate flowers, anther 4-thecous, ovary globose, ovules 1-6. Fruits 1-5-seeded. Seeds ribbed longitudinally.
A small genus of c. 15 species distributed in both the hemispheres of the world, represented in Pakistan by 5 species.
|
|
|
|
| 1 |
Fronds submerged, or floating; translucent, ± acute and serrulate at apex, forming branched chains |
|
1 Lemna trisulca |
| + |
Fronds floating; opaque, ± obtuse and entire at apex and margins, not forming Chains |
|
(2) |
| |
|
|
|
| 2 (1) |
Fronds forming turions |
|
2 Lemna turionifera |
| + |
Fronds not forming turions |
|
(3) |
| |
|
|
|
| 3 (2) |
Fronds gibbous beneath; air spaces often larger than 03 mm |
|
3 Lemna gibba |
| + |
Fronds flat beneath; air spaces smaller than 03 mm |
|
(4) |
| |
|
|
|
| 4 (3) |
Root sheath not winged, cap obtuse. Flowers enclosed in ± closed spathe |
|
4 Lemna minor |
| + |
Root sheath winged, cap acute. Flowers surrounded by an open spathe |
|
5 Lemna aequinoctialis |
|
|
|
Lower Taxa
Related Synonym(s):
| Related Links (opens in a new window) |
|
Treatments in Other Floras @ www.efloras.org
Other Databases
|
|
|
|
|
|
|
|
|
