3. Amsinckia tessellata A. Gray (devils lettuce)
Map 1287, Pl.
305 j–l
Stems 15–60 cm
long, densely pubescent, with the longer, bristly hairs 2–4 mm long. Leaves 2–8
cm long, 6–20 mm wide. Inflorescences elongating to 5–20 cm long. Flower stalks
1–2 mm long. Calyx lobes mostly 3 or 4, with 1 or 2 pairs of the
developmentally 5 lobes usually fused and thus appearing unequal in width,
these usually notched at the tip, 6–8 mm long, 1–2 mm wide. Corollas 8–12 mm
long, orangish yellow to orange, the tube 5–9 mm long, with 20 faint nerves
below the midpoint, the throat without scalelike appendages, sometimes with
scattered hairs or glands, the lobes 1.0–1.5 mm long. Stamens attached above
the midpoint of the tube, the filaments 0.2–0.4 mm long, anthers 0.7–1.0 mm
long. Style 3–4 mm long. Nutlets 2.5–4.0 mm long, 1.5–3.0 mm wide, the surface
with dense, broadly rounded tubercles, these often fused irregularly into blunt
ridges. 2n=24. May–July.
Introduced,
uncommon, known thus far only from the city of St. Louis
(western U.S. east to Idaho and New Mexico; Canada, Mexico;
introduced in Missouri).
Railroads.