Nicotiana umbratica N. Burb., Austral. J. Bot. 8: 352; fig. 6; t. 11, fig. 1 (1960)
T: Woodstock Stn, Pilbara District, W.A., received May 1958, E.H.M. Ealey E.161; holo: CANB; iso: K n.v., photo ADW.
Herb to c. 70 cm, variably pubescent with glandular hairs.
Leaves mostly cauline, broadly cordate to triangular, the upper ones narrowly ovate, occasionally linear; lamina up to 12 cm long, 10 cm wide; petiole to 11 cm long, very narrowly winged, not stem-clasping.
Inflorescence panicle-like, few-branched. Calyx 6–15 mm long. Corolla-tube 40–65 mm long (occasionally shorter), 1–2.5 mm wide at top of calyx; limb 20–35 mm diam., the lobes usually acute. Upper 4 anthers borne at slightly different levels, their filaments 1.5–2.5 mm long; 5th filament 2–7 mm long, inserted in upper half of corolla-tube.
Capsule ovoid-ellipsoid, 6–10 mm long. Seeds reniform; testa irregularly honeycombed or wrinkled. n=23.
Distribution and ecology
Restricted to western part of Pilbara District of W.A.
Typically grows in shelter of large boulders on rocky outcrops.
Similar in appearance to N. cavicola, but distinguishable from it by its subterete, rather than broadly-winged, petioles.
A valuable summary of the cultural use of Nicotiana species in Australia is provided in D.E.Symon (2005). Native tobaccos (Solanaceae: Nicotiana spp.) in Australia and their use by Aboriginal peoples. The Beagle 21: 1-10.
W.A.: Eginbah Stn, N.T. Burbidge 1048 (PERTH); Woodstock Stn, N.T. Burbidge 5820 (AD, CANB, MEL, PERTH).
Further information for this species in WA can be found on the FloraBase site.