Flora of North America species comparison

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Fatoua villosa

hairy crabweed, mulberry-weed
Habit Herbs, to ca. 8 dm.
Stems

erect, branched, pubescent with hooked trichomes.
Leaves

blade to 2.5-10 × 1-7 cm, papery, base cordate to truncate, margins crenate-dentate, apex acute to acuminate;

surfaces abaxially and adaxially appressed-hirsute.
Inflorescences

cymes, dense, 4-8 mm wide, subtended by narrow bract;

peduncle 1-2 cm.
Flowers

light green, staminate and pistillate in same cyme.
Staminate flowers

calyx campanulate;

stamens exserted.
Pistillate flowers

calyx boat-shaped;

ovary globose, puberulent, somewhat depressed in axis;

style reddish purple, filiform.
Achenes

white, oval, 3-angled, ca. 1 mm, minutely muricate, with 2 triangular, membranous appendages.
Seeds

explosively expelled.

Fatoua villosa
Phenology Flowering summer–fall.
Habitat Disturbed sites
Elevation 0-300 m (0-1000 ft)
Distribution
from FNA
AL; AR; FL; GA; KY; LA; MD; MO; MS; NC; OH; OK; SC; TN; TX; VA; WV; West Indies (Bahamas); native to Asia [Introduced in North America]
[WildflowerSearch map]
[BONAP county map]
Discussion

Fatoua villosa was first reported for North America from Louisiana by J. W. Thieret (1964). It has become widespread in the eastern and lower midwestern states where it often occurs as a weed in greenhouses and disturbed sites. Apparently it spreads from the distribution of horticultural materials.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 3.
Parent taxa Moraceae > Fatoua
Synonyms Urtica villosa
Name authority (Thunberg) Nakai: Bot. Mag. (Tokyo) 4: 516. (1927)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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