Flora of the Hawaiian Islands
Dicotyledon Literature for Crotalaria spectabilis
Wagner et al., 1990, 1999; Lorence & Wagner, 2020.
   Fabaceae -- The Pea Family Bibliography
      Crotalaria spectabilis

Common name(s): rattlepod, kolomona (Ni`ihau)
General Information
DistributionNative to India.In the Hawaiian Islands, naturalized on Ni`ihau, Kaua`i, O`ahu, Moloka`i, Hawai`i.

Annual herb; stems erect, to 20 dm long, ridged, glabrous or nearly so.
Leaves simple, petiolate; blade elliptic, rhombic obovate, or oblanceolate, 5.5–14 cm long, 2.8–7.4 cm wide, veins 6–11 on each side of midrib, adaxial surface glabrous and slightly punctate, abaxial surface sparsely to densely appressed pubescent, apex rounded and often mucronate, base cuneate; petiole 4–7 mm long; stipules triangular, to 10 mm long.
Inflorescences a terminal or axillary, somewhat lax raceme, 15–40-flowered, rachis 13.5–42 cm long (including peduncle); bracts ovate, 8–15 mm long, spreading, usually persistent, bracteoles at or below mid-pedicel, ovate to triangular. Flowers 15–27 mm long; calyx glabrous, tube 5.5–7.5 mm long, lobes 5.5–10 mm long, lateral lobes distinct at apex; petals yellow, standard 12–16 mm long, 14–18 mm wide, wings broadly oblong, 9–12 mm long, 7.5–11 mm wide, keel petals short, beak twisted and ciliate, margin ciliate; elongated anthers 2.5–3.1 mm long, short ones 0.7–1 mm long.
Fruit brown or dark brown at maturity, 3.2–4 cm long, nonstipitate, glabrous.
Seeds ca. 22 per pod, dark brown, to 4.5 mm long, smooth.
2n = 16.
Nancy Khan