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narrow-leaf owl-clover, thin-leaf owl's-clover, thin-leaf owl-clover

Habit Annuals 8–35 cm.
Stems

erect or ascending, pilose and puberulent.

Leaves

10–50 mm;

blade: proximal margins entire, distal 3–7-lobed.

Inflorescences

racemes, 2–6 cm;

bracts 10–20 mm, margins 3–5-lobed in proximal 1/2, proximal not resembling distal leaves, midlobe purple-pink distally, ovate, 4–6 mm wide, apex obtuse, cuspidate, lateral lobes narrowly triangular.

Pedicels

1–2 mm.

Flowers

calyx 8–12 mm;

corolla 14–20 mm, equal to or slightly longer than bracts, abaxial lip inflated, lobes 3, triangular, adaxial lip purple-pink, 5 mm, 1 mm longer than abaxial, puberulent, tip notably hooked, not bearded.

Capsules

6–7 mm, apex acute.

Seeds

15–20, dark brown, ovoid to reniform, 1–1.5 mm, shallowly reticulate, not ridged.

2n

= 28.

Orthocarpus tenuifolius

Phenology Flowering May–Aug.
Habitat Moist fields, grasslands, rocky slopes.
Elevation (300–)600–2500 m. ((1000–)2000–8200 ft.)
Distribution
from FNA
ID; MT; OR; WA; WY; BC
[WildflowerSearch map]
[BONAP county map]
Discussion

Orthocarpus tenuifolius is one of the plants first collected by Meriwether Lewis during the Corps of Discovery Expedition.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 17, p. 683.
Parent taxa Orobanchaceae > Orthocarpus
Sibling taxa
O. barbatus, O. bracteosus, O. cuspidatus, O. imbricatus, O. luteus, O. pachystachyus, O. purpureoalbus, O. tolmiei
Synonyms Bartsia tenuifolia
Name authority (Pursh) Bentham: Scroph. Ind., 12. (1835)
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