Plantago princeps var. longibracteata is a robust perennial herb. The stems are densely woolly, unbranched, and grow to 10 cm long. The leaves are simple and tufted near the stem tips. Leaf blades are narrowly oblong-lanceolate to narrowly elliptic or sometimes elliptic, measuring 6–30 cm long and 1.5–5 cm wide, without separating from petioles. The apex is acute to acuminate, and the base is slightly narrowed or gradually attenuates to a winged petiole. The surfaces are typically glabrous, though lower surfaces can be appressed pilose, and the blades are thick and coriaceous. Margins are minutely and remotely denticulate or entire, with (3–)5–9 veins usually converging near the base. Petioles are up to 5 cm long and winged. Stipules are absent. The flowers are borne on scapes, typically several in number, measuring 10–50 cm long with spikes ranging from (7–)11–28 cm long. The flowers are arranged in loose to moderately congested spikes, each ascending. Bracts are lanceolate, 1.2–3 mm long, and glabrous, sometimes woolly at the base, with no bracteoles. The flowers are bisexual, with a calyx of 4 subequal sepals that are elliptic to elliptic–ovate, 1.8–3.2 mm long, scarious except for the midrib, and can be glabrous or ciliate with a sometimes minutely erose apex. The corolla is salverform, 4-lobed, scarious, and persistent in fruit. Stamens are 4, alternate with corolla lobes, with long-exserted anthers. The ovary is superior, with 2 carpels and axile placentation. The fruit is a narrowly ovoid–ellipsoid capsule 3–3.8 mm long, enclosed by the persistent calyx, slightly exserted, and dehisces from ⅔ toward the base. Seeds are 3–4 in number, ellipsoid to oblong–ellipsoid, measuring 1.5–2.1 mm long with a mucilaginous membrane and firm, translucent endosperm. It occurs on steep slopes, rock walls, or at the bases of waterfalls between 790–800 meters.