Common name: Blue Toadflax
Nuttallanthus canadensis (L.) D.A.Sutton APNI*
Synonyms: Linaria canadensis (L.) Dum.Cours. APNI*
Linaria canadensis (L.) Dum.Cours. var. canadensis APNI*
Linaria canadensis (L.) D.A.Sutton APNI*
Description: Slender glabrous biennial or winter annual to 75 cm tall, with a rosette of prostrate stems (over wintering branches) to 10 cm long. Note: plant glabrous except for a glandular hairy inflorescence.
Leaves often opposite or whorled on overwintering branches, alternate otherwise, linear, to 3 cm long, 1–2 mm wide.
Inflorescence many-flowered, congested at anthesis, elongating in fruit; bracts 1.5–3 mm long; pedicels ascending, 2–4 mm long in fruit. Sepals 2–3 mm long. Corolla 8–13 mm long, blue to violet blue with a 2-ridged white or pale palate; spur 5 mm long; upper lip recurved, shorter than the recurved lower lip. Glandular hairs present on inflorescences axis and pedicels.
Capsule compressed-globose, 2.5–3 mm long, emarginate; seeds brown, 0.4–0.5 mm long, surface usually smooth, sometimes with a few tubercles between thin, entire longitudinal ridges.
Flowering: Spring – summer.
Distribution and occurrence: Naturalised in a mining rehabilitation area at Tomago (north Newcastle), native of North America.
NSW subdivisions: *NC
For diagnostic features refer notes under N. texanus.
Text by Louisa Murray (2011), modified Barry Conn (2014); modified Barry Conn and Louisa Murray (2015)
Taxon concept: D.A. Sutton (1988) A revision of the tribe Anthirrhineae (Oxford University Press: London & Oxford).
This species was described under Linaria canadensis var. canadensis in Fl. of NSW, Vol.3 1992
APNI* Provides a link to the Australian Plant Name Index (hosted by the Australian National Botanic Gardens) for comprehensive bibliographic data
***The AVH map option provides a detailed interactive Australia wide distribution map drawn from collections held by all major Australian herbaria participating in the Australian Virtual Herbarium project.