Burke: Nuttallanthus canadensis vs. Nuttallanthus texanus

	Nuttallanthus canadensis	Nuttallanthus texanus
	Canada toadflax, old field toadflax	blue toadflax, Texas toadflax
Habit		Slender, glabrous annual or winter annual from a short taproot, the stems 1-5 dm. tall, with a whorl of prostrate stems at the base, these with opposite or ternate leaves; main stems 1-several from the base, simple and erect.
Leaves		Main stems leaves mostly alternate, sessile, sparse, linear, 1-3.5 cm. long and 1-2.5 mm. wide, the lower often opposite.
Flowers		Flowers in nearly naked, terminal racemes; calyx of 5 distinct sepals; corolla light blue, bilabiate, 10-12 mm. long exclusive of the slender, downward-curved spur 5-9 mm. long, the lower lip 3-lobed, much larger than the erect, 2-lobed upper lip; stamens 4.
Fruits		Capsules ellipsoid, 2.5-4 mm. long; seeds densely tuberculate.

	Nuttallanthus canadensis	Nuttallanthus texanus
Flowering time	May-June	May-June
Habitat	Prairies, balds, and other open areas at low elevations.	Prairies, grasslands, and balds.
Distribution	Occurring west of the Cascades crest in Washington; southwestern British Columbia and Puget Trough islands to western Oregon and California. [WildflowerSearch map] [BONAP county map]	Occurring west of the Cascades crest in Washington; British Columbia to California, east to Sasketchewan and across much of the U.S. except the upper Midwest and Northeast. [WildflowerSearch map] [BONAP county map]
Origin	Native	Native
Conservation status	Not of concern	Threatened in Washington (WANHP)
Sibling taxa	N. texanus	N. canadensis
Web links	Local floras: BC, OR, WA Local Web sites: Flora NW, PNW Herbaria, Turner Photog. WildflowerSearch iNaturalist (observations) USDA Plants Database LBJ Wildflower Center SEINet Plants of the World Online Encyclopedia of Life Wikipedia Google Image Search	Local floras: BC, CA, OR, WA Local Web sites: CalFlora, CalPhotos, Flora NW, PNW Herbaria WildflowerSearch iNaturalist (observations) USDA Plants Database LBJ Wildflower Center SEINet Plants of the World Online Encyclopedia of Life Wikipedia Google Image Search

Nuttallanthus texanus

Canada toadflax, old field toadflax

blue toadflax, Texas toadflax

Habit

Slender, glabrous annual or winter annual from a short taproot, the stems 1-5 dm. tall, with a whorl of prostrate stems at the base, these with opposite or ternate leaves; main stems 1-several from the base, simple and erect.

Leaves

Main stems leaves mostly alternate, sessile, sparse, linear, 1-3.5 cm. long and 1-2.5 mm. wide, the lower often opposite.

Flowers

Flowers in nearly naked, terminal racemes;

calyx of 5 distinct sepals;

corolla light blue, bilabiate, 10-12 mm. long exclusive of the slender, downward-curved spur 5-9 mm. long, the lower lip 3-lobed, much larger than the erect, 2-lobed upper lip;

stamens 4.

Fruits

Capsules ellipsoid, 2.5-4 mm. long;

seeds densely tuberculate.

Nuttallanthus canadensis

Nuttallanthus texanus

Flowering time

May-June

Habitat

Prairies, balds, and other open areas at low elevations.

Prairies, grasslands, and balds.

Distribution

Occurring west of the Cascades crest in Washington; southwestern British Columbia and Puget Trough islands to western Oregon and California.

[WildflowerSearch map]

[BONAP county map]

Occurring west of the Cascades crest in Washington; British Columbia to California, east to Sasketchewan and across much of the U.S. except the upper Midwest and Northeast.

[WildflowerSearch map]

[BONAP county map]

Origin

Native

Conservation status

Not of concern

Threatened in Washington (WANHP)

Sibling taxa

N. texanus

N. canadensis

Web links