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 perennial herbs, with alternate leaves, or the lower and those of sterile shoots opposite, and mostly large red purple yellow or white flowers, in terminal racemes, or solitary in the upper axils. Calyx 5-parted, the segments imbricated. Corolla irregular, gibbous, or saccate, but not spurred at the base, 2-lipped, the upper lip erect, 2-lobed, the lower spreading, 3-lobed, its base produced into a palate nearly or quite closing the throat. Stamens 4, didynamous, included; filaments filiform, or dilated at the summit. Style filiform. Capsule ovoid or globose, opening by chinks or pores below the summit. Seeds numerous, oblong, truncate, rugose or smooth, not winged. [Greek, nose-like.]
About 40 species, natives of Europe, Asia and western North America. Besides the following introduced species, some 18 others inhabit the western United States. Type species: Antirrhinum majus L.
Flowers 1'-1 1/2' lone: calyx-segments ovate, much shorter than the corolla.
1. A. majus.
Flowers 5"-7" long; calyx-segments linear, as long as the corolla.
2. A. Orontxum.
Fig. 3747. Antirrhinum Majus L. Sp. Pl. 617. 1753
Perennial, glabrous below, usually more or less glandular-pubescent above; stem branched or simple, 1°-3° high. Leaves lanceolate, linear or oblong-lanceolate, entire, short-petioled, acute at both ends, rather firm, glabrous. 1'-3' long, 1"-5" wide; flowers racemose, purplish-red (of a variety of colors in cultivated forms), 1'-1 1/2' long; pedicels rather stout, 3"-6" long, erect in fruit; calyx-segments oval to ovate, obtuse, 2"-3" long; capsule obliquely ovoid, 4"-5" high, opening by 2 pores just below the summit or at length apically 2-valved, much longer than the calyx.
In waste places, sparingly escaped from gardens in the Atlantic States. Adventive from Europe. Other English names are rabbit's mouth, bonny rabbits, calf-snout, dragon's-, tiger's-, dog's- or toad's-mouth. Bulldogs. Lion's-snap. June-Sept.
Antirrhinum Orontium L. Sp. Pl. 617. 1753.
Annual, glabrous or pubescent; stem erect, simple, or branched, slender, about 1° high. Leaves narrowly linear, or the lower linear-spatulate, almost sessile, narrowed at both ends, 1'-2' long, 1"-2" wide; flowers solitary in the upper axils, purple, mostly distant, S"-7" long; peduncles shorter than the flowers; calyx-segments linear, somewhat unequal, as long as the corolla, elongated in fruit so as much to exceed the pubescent capsule.
Fields and waste places, Ontario, New England, New York, Vancouver Island and Jamaica. Adventive from Europe. Native also of Asia. Corn-snapdragon. June-Aug.