I. ANTIRRHINIDEÆ. Upper lip or lobes of the corolla covering the lower in the bud (with occasional exceptions in Mimulas, etc.) Capsule usually septicidal.
Tribe I. VERBASCEÆ. Corolla rotate. Flowers racemose. Leaves alternate.
1. Verbascum. Stamens 5, all with anthers, and 3 or all with bearded filaments.
Tribe II. ANTIRRHINEÆ. Corolla tubular, with a spur or sac at the base below, the throat usually with a palate. Capsule opening by chinks or holes. Flowers in simple racemes or axillary. Lower leaves usually opposite or whorled. Stamens 4.
2. Linaria. Corolla spurred at base; the palate seldom closing the throat.
3. Antirrhinum. Corolla merely saccate at base; the palate closing the throat.
Tribe III. CHELONEÆ. Corolla tubular, or 2-lipped, not spurred nor saccate below. Capsule 2–4-valved. Leaves opposite. Inflorescence usually compound, of small axillary spiked or racemed or umbel-like clusters or cymes, or when reduced to a single flower the peduncle mostly 2-bracteate. Stamens 4, and usually a rudiment of the fifth.
4. Scrophularia. Corolla inflated, globular or oblong, with four erect lobes and one spreading one. Rudiment of the sterile stamen a scale on the upper lip.
5. Collinsia. Corolla 2-cleft, the short tube saccate on the upper side; the middle lobe of the lower lip sac-like and enclosing the declined stamens.
6. Chelone. Corolla tubular inflated above. Sterile stamen shorter than the others. Anthers very woolly. Seeds winged.