The green links below add additional plants to the comparison table. Blue links lead to other Web sites.
enable glossary links

artillery plant, artillery weed, pistol plant, rockweed

Habit Herbs, annual or short-lived perennial, 0.3-2 dm.

10-40-branched, erect.


blades spatulate to obovate, paired blades unequal, the larger 3-10 × 1.5-5.5 mm, the smaller 1.5-4 × 0.7-2 mm, margins entire.




ca. 0.5 mm across.


uniformly light brown, slightly compressed, ovoid-cylindric, ca. 0.5(-1.1) × 0.3 mm, smooth.

Pilea microphylla

Phenology Flowering all year.
Habitat Waste places, hammocks, rocky woods, cultivated plots, on masonry
Elevation 0-100 m (0-300 ft)
from FNA
FL; GA; LA; SC; HI; Mexico; Central America; West Indies; tropical South America; Asia
[WildflowerSearch map]
[BONAP county map]

Pilea microphylla has been collected once in Tennessee and once in Michigan, but it is unlikely that the species persists so far north. It is widely grown as a houseplant in the north and a border plant in the south. It is a greenhouse weed in various parts of the flora.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 3.
Parent taxa Urticaceae > Pilea
Sibling taxa
P. fontana, P. herniarioides, P. pumila, P. trianthemoides
Synonyms Parietaria microphylla
Name authority (Linnaeus) Liebmann: Naturvidensk. Math. Afd., ser. 5, 2: 296. (1851)
Web links