408 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



10. CASTILLEJA Mutis. Indian paintbrush. 



Perennials, often parasitic upon the roots of other plants; stems simple or with a 

 few branches above; leaves sessile, entire or lobed, those among the flowers (bracts) 

 colored with red or yellow; flowers in dense spikes; corolla 2-lipped, the upper lip 

 (galea) long and narrow, the lower lip 3-lobed.— The species are poorly understood, 

 and whether all those listed below are valid is doubtful. The bracts exhibit great 

 variation in color in each species. It seems probable to the writer that the species 

 hybridize freely. The plants, especially those with red bracts, are very showy, and 

 they are among the most conspicuous and abundant flowers of the park. In many 

 places they are extremely abundant and offer an almost solid field of color. 

 Galea less than 3 times as long as the lip, half as long as the corolla tube or shorter; 

 bracts tinged with yellow. 



Leaves, at lease most of them, lobed 1. C. lutea. 



Leaves entire, or only the uppermost lobed. 

 Stems 25 to 50 cm. high; spikes only slightly hairy, mostly with short hairs; 



corolla about 2.5 cm. long 2. C. sulphurea. 



Stems usually less than 20 cm. high; spikes very hairy, with long whitish hairs; 



corolla about 1.8 cm. long 3. C. occidentalis. 



Galea several times longer than the very short lip, usually at least two-thirds as long 

 as the corolla tube; bracts tinged with red or pink, except in occasional abnormal 

 plants. 

 Leaves, at least most of them, conspicuously lobed. 



Corolla 2 to 2.5 cm. long, only slightly if at all longer than the bracts. 



4. C. bradburyi. 



Corolla about 3 cm. long, much longer than the bracts 5. C. ampliflora. 



Leaves entire, or only the uppermost sometimes lobed. 



Bracts entire, obtuse, broad, sometimes 3-lobed, but then with a broad obtuse 

 middle lobe. 



Corolla about 3 cm. long 6. C. rhexifolia. 



Corolla 2 to 2.5 cm. long 7. C. lauta. 



Bracts lobed, with narrow acute lobes, occasionally entire but then acute. 



Corolla 3.5 to 4 cm. long 8. C. vreelandii. 



Corolla 3 cm. long or shorter. 



Corolla about 2 cm. long 9. C. miniata. 



Corolla about 3 cm. long 10. C. lancifolia. 



1. Castilleja lutea Heller. Occasional at low altitudes, on prairie or open slopes. 

 Wash, to Mont. — Stems simple, 20 to 30 cm. high, hairy; leaves 2 to 5 cm. long, 3 or 

 5-ribbed; corolla about 2.5 cm. long; bracts pale sulphur-yellow. 



2. Castilleja sulphurea Rydb. Occasional on the east slope at low altitudes, on 

 prairie or open hillsides. Mont, to Utah, N. Mex., and S. Dak. — Stems finely hairy, 

 often bmnched; leaves lanceolate, 3 to 5 cm. long, 3-ribbed. 



3. Castilleja occidentalis Torr. Common above timber line, in meadows or on 

 rock slides. B. C. and Alta. to Colo. — Stems 10 to 20 cm. high, simple, usually tufted, 

 finely hairy below; leaves linear or linear-lanceolate, 1.5 to 4 cm. long; bracts pale 

 yellow-green or sometimes dirty pink. 



4. Castilleja bradburyi (Nutt.) Don. Occasional on the east slope at low and 

 middle altitudes, in thin woods or on open hillsides. B. C. to Oreg., Wyo., and 

 Mont. — Stems 20 to 40 cm. high, sometimes branched, usually in clumps; leaves 

 3-ribbed, 3 to 5 cm. long, with few linear lobes; bracts scarlet or sometimes orange or 

 bright yellow. 



The plants are scattered and it is unusual to find many in a place. This is the only 

 species of the park which has distinctly scarlet bracts. 



