(nat) Tree tobacco, mustard tree, makahala, paka
Shrubs or small spindly trees, glabrous except for corolla tube. Leaves simple, alternate, glaucous, ovate to ovate-lanceolate, often 4-10 cm long, 2-8 cm wide, gla-brous, margins entire, apex obtuse to broadly acuminate, base obtuse, petioles terete, 1-6 cm long. Flowers in short, dense, terminal panicles, pedicels up to 15 mm long, bracts lanceolate, 2-7 mm long; calyx usually 7-14 mm long, the lobes narrowly elliptic, connate ca. 3A their length, intersepalar membrane inconspicuous; corolla tube 20-40 mm long, 3-4 mm wide at apex of calyx, the tube proper narrower than throat cylinder, throat cup symmetrical, yellow or yellowish, corolla limb 9-13 mm in diameter, remaining open in daylight, the lobes obtuse, connate most of their length; stamens equal or nearly so; filaments inserted in lower 1/2 of tube, 20-30 mm long. Capsules ovoid-ellipsoid to nearly subglobose, equalling or shorter than calyx, 7-13 mm long. Seeds numerous, reniform to oblong-reniform, 0.5-0.9 mm long, testa honeycombed or with wrinkles. Self-compatible; [2n = 24, 36, 48.] Native to Argentina, now widely naturalized in warm temperate regions of the world; in Hawaii naturalized in open, arid, disturbed sites, 3-350 m, on 0‘ahu, Lanai, Maui, and Kaho‘olawe. First collected on O'ahu (cultivated material) in 1864-1865 (Mann & Brigham 296, BISH).—Plate 184.