=Blue Vervain.= _Verbena hastata_ L. Achenes crowded, four together until mature, dull, reddish brown, flattened, oblong, 1.7-2 mm. long, bordered by a narrow margin, the outer face convex, bearing 3-5 small vertical ridges branching and uniting at the apex, forming a distinct network, the inner face sloping to the margin from a central vertical ridge; a light colored scar is seen on one side of the base. Native to this country. Not important. [Illustration: Fig. 154.] =Nettle-leaved Vervain.= _Verbena urticifolia_ L. Achenes 1.6-1.8 mm. long, very closely resembling the last above mentioned. The achenes of this one are a trifle shorter and broader, more nearly oval than oblong. Native to this country. Not common in fields. MINT FAMILY. LABIATAE. [Illustration: Fig. 155.] =Dead Nettle.= _Lamium amplexicaule_ L. Achenes light brown, conspicuously marked by white spots some of which coalesce making the surface striped crosswise, obovate-oblong, pointed at the smaller end, 1.5-2 mm. long, the outer surface rounded, the inner face angled, the concave surfaces sloping to the edges from a central vertical ridge. Introduced from Europe. Thrives in cool weather. [Illustration: Fig. 156.] =Motherwort.= _Leonurus Cardiaca_ L. Achenes light brown, obovoid-oblong, rounded on one side flat on the other two sides, the truncate apex hairy, 2-2.4 mm. long. Introduced from Europe. Waste places. [Illustration: Fig. 157.] =White Hoarhound.= _Marubium vulgare_ L. Achenes dull, varying from light to dark brown, sometimes finely roughened by numerous minute tubercles, slightly flattened, oval or obovoid, about 2 mm. long, outer surface convex, inner face angled sloping to the edges from a central vertical ridge, edges of achenes often slightly margined, surface lightly grooved. Introduced from Europe. A weed in northern Michigan where snow protects it in winter. [Illustration: Fig. 158.] =Catnip. Catmint.= _Nepeta Cataria_ L. Achenes dull, light reddish brown to nearly black, with two laterally placed cavities near the base, each filled with white spongey tissue, broadly oval, slightly flattened, 1.3-1.7 mm. long. Introduced from Europe. Scarcely a weed. [Illustration: Fig. 159.] =Self-heal. Heal-all.= _Prunella vulgaris_ L. Achenes light to dark brown, slightly roughened, having a diffused luster, slightly flattened, oval or oblong, the base tapering to a small whitish, triangular appendage, outer side convex having dark verticle lines, the other face sloping to the edges from a central ridge, becoming mucilaginous when soaked in water. Native to this country. NIGHT SHADE FAMILY. SOLANACEAE. [Illustration: Fig. 160.]