Proc. Amer. Acad. Arts 7: 382. 1868.
Stems erect or ascending, 10–90 (–120) cm, densely puberulent and glandular-puberulent, and pilose. Leaves puberulent and pilose; proximal 15–40 mm, margins 3-lobed, lobes 0.1–0.5 mm wide; distal 10–25 × 0.1–0.3 mm, margins entire. Inflorescences spikes, 2-flowered or 3-flowered, or flowers solitary; bracts 1–4, 10–20 mm, margins entire or 3-lobed, lobes green or purple distally, linear-lanceolate. Pedicels: bracteoles 15–20 mm, margins entire or toothed. Flowers: calyx 15–20 mm, tube 0–1 mm, apex 2-fid, cleft 0.5–1 mm; corolla pale-yellow to yellow-green, streaked and spotted with maroon, 15–20 mm, tube 5–10 mm, throat 5–8 mm diam., abaxial lip 5–10 mm, ca. equal to and appressed to adaxial; stamens 4, filaments hairy, fertile pollen-sacs 2 per filament, equal. Capsules oblong-ovoid, 6–10 mm. Seeds 10–18, dark-brown, ovoid, 1.5–2.5 mm, striate. 2n = 28.
Subspecies 2 (2 in the flora).