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Published In: Beiträge zur Botanik 1: 233. 1844. (11-13 Jul 1844) (Beitr. Bot.) Name publication detail
 

Project Name Data (Last Modified On 6/2/2011)
Acceptance : Accepted
Project Data     (Last Modified On 6/3/2011)
Contributor Text: RIZWAN Y. HASHMI & SAOOD OMER
General/Distribution: The genus, with 9 species, is widely distributed in both hemispheres. In Pakistan, it is represented by four species.

 

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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.
 

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1 Fronds flat above, with 5-6 corners, conical beneath 4 Wolffia microscopica
+ Fronds not as above (2)
2 (1) Fronds boat like, 2 or more times as deep as wide, biggest width near the water surface 3 Wolffia angusta
+ Fronds globose-ovoid, 1-1½ times as deep as wide, biggest width under water (3)
3 (2) Fronds ovate-orbicular, dark green on upper side, with (10-) 15-100 stomata 2 Wolffia arrhiza
+ Fronds elliptic-globose, transparent green on upper side, with 1-10 (-30) stomata 1 Wolffia globosa
 
 
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