NETTLE FAMILY. URTICACEAE.
Fig 30. [Slender Nettle. Urtica gracilis] Ait.
![[Slender Nettle. Urtica gracilis]](#1525880611323293367_fig-030.jpg.id-4194384730803746121.wrap-0.html.html){kind=link}
Slender Nettle. Urtica gracilis Ait. Achenes compressed, lens-shaped, ovate, rarely oval, faces similar, smooth, dull and grayish brown, .9–1.1 mm. long. Native of this country. Compared with U. dioica, this achene is thinner and shorter. Prominent in low pastures.
BUCKWHEAT FAMILY. POLYGONACEAE.
Fig 31. [Knot-Grass. Polygonum aviculare] L.
![[Knot-Grass. Polygonum aviculare]](#1525880611323293367_fig-031.jpg.id-5380638319134151184.wrap-0.html.html){kind=link}
Knot-Grass. Polygonum aviculare L. This door-yard weed is in no sense a grass. Achenes unequally 3-sided, ovoid, acute, angles obtuse, surface, dull, light to dark reddish brown, finely granular and striate lengthwise. 1.8–2.2 mm. long, usually with the remains of calyx attached. Native of this country. Common about door-yards.