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3. Wolffia Schleid. in Linnaea. 13: 389. 1839. (nom. cons.); Boiss., Fl. Or. 5:29. 1884; Dumort in Komarov, Fl. U.R.S.S. 3. 391. 1935; den Hartog & van dar Plas in Blumea 18(2): 366. 1970; Riedl in Rech. f., Fl. Iran. 119: 6. 1976; Landolt, Veroff. Geobot. Inst. ETH. 70: 20-21. 1980; Uotila in Davis, Fl. Turk. 8: 64. 1984.
RIZWAN Y. HASHMI & SAOOD OMER
Minute, free floating rootless herbs. Fronds symmetrical, thick, ± globular, ellipsoid, not more than 1.5 mm in diameter, veinless, flattened on the upper surface of the water level, daughter thallus produced in a circular lateral pit and soon gets detached from the parent, 1-staminate and 1-pistillate flower in a pit on the upper surface of the median line; spathe absent.
The genus, with 9 species, is widely distributed in both hemispheres. In Pakistan, it is represented by four species.
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| 1 |
Fronds flat above, with 5-6 corners, conical beneath |
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4 Wolffia microscopica |
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Fronds not as above |
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(2) |
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| 2 (1) |
Fronds boat like, 2 or more times as deep as wide, biggest width near the water surface |
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3 Wolffia angusta |
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Fronds globose-ovoid, 1-1½ times as deep as wide, biggest width under water |
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(3) |
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| 3 (2) |
Fronds ovate-orbicular, dark green on upper side, with (10-) 15-100 stomata |
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2 Wolffia arrhiza |
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Fronds elliptic-globose, transparent green on upper side, with 1-10 (-30) stomata |
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1 Wolffia globosa |
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Lower Taxa
Related Synonym(s):
| Related Links (opens in a new window) |
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Treatments in Other Floras @ www.efloras.org
Other Databases
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