This section is from the book "An Illustrated Flora Of The Northern United States, Canada And The British Possessions Vol3", by Nathaniel Lord Britton, Addison Brown. Also available from Amazon: An Illustrated Flora of the Northern United States, Canada and the British Possessions. 3 Volume Set..
Annual or rarely perennial herbs, mostly with alternate leaves, and yellow white or purplish flowers, in bracted usually dense spikes, the bracts sometimes brightly colored. Calyx tubular or tubular-campanulate, 4-cleft, or sometimes split down both sides. Corolla very irregular, the tube slender, the limb 2-lipped; upper lip little if any longer than the 3-lobed 1-3-saccate lower one. Stamens 4, didynamous, ascending under the upper lip; anther-sacs dissimilar, the outer one affixed by its middle, the inner pendulous from its upper end, commonly smaller. Style filiform; stigma entire. Capsule oblong, loculicidally dehiscent, many-seeded. Seeds reticulated. [Greek, erect-fruit]
About 30 species, natives of America, mostly of the western United States, 1 or 2 Andean. Type species: Orthocarpus Iuteus Nutt.
Orthocarpus luteus Nutt. Gen. 2: 57. 1818.
Annual, rough-pubescent or puberulent; stem strict, erect, branched above, or simple, 6'-18' high, densely leafy. Leaves erect or ascending, linear or lanceolate, entire, or sometimes 3-cleft, 1'-1 1/2' long, 1"-2" wide, sessile, long-acuminate; bracts of the dense spike lanceolate, broader and shorter than the leaves, entire or 3-cleft, acute, green, mostly longer than the flowers; flowers bright yellow, 4"-S" long; calyx-teeth acute, shorter than the tube; corolla about twice as long as the calyx, puberulent without, its upper lip ovate, obtuse, about as long as the saccate 3-toothed lower one; capsule about as long as the calyx-tube.