102 
PLANTS OF YELLOWSTONE NATIONAL PARK 
with a 5-lobed, persistent calyx, a 5-lobed, tubular corolla, 5 stamens 
and 1 pistil with a 3-lobed style. The fruit is a dry pod or capsule. 
1. Leaves opposite. 2. 
1. Leaves alternate. 3. 
2. Leaves entire. Phlox (Phlox) _(p. 102) 
2. Leaves palmately divided into narrow segments. Gilia harknessii _(p. 103) 
3. Leaves pinnate. Polemonium ( Polemonium )_ (p. 103) 
3. Leaves simple. 4. 
4. Stems woody. Prickly gilia (Gilia pungens) _____(p. 103) 
4. Stems not woody. 5. 
5. Leaves lobed. Navarretia intertexta __ _.____ __...__ (p. 102) 
5. Leaves entire. 6. 
6. Flowers lavender or lilac-purple. Collomia linearis _(p. 103) 
6. Flowers white or pinkish. Threadflower gilia (Gilia micrantha) _(p. 103) 
Figure 79.—Phlox. White. Copyright, J. E. Haynes. 
Phlox {Phlox ).—Plants with opposite, sessile, entire leaves and 
medium-sized flowers. The corolla has a long, narrow tube and 
broad, flat lobes. The six species that are found in the park may be 
distinguished in the following manner: 
1. Flowers blue or bluish. 2. 
1. Flowers white. 3. 
2. Flowers bright blue or lilac. Phlox kelseyi. 
2. Flowers pale blue or nearly white. Phlox caespitosa. 
3. Leaves more than an inch long. Phlox longifolia. 
3. Leaves less than an inch long. 4. 
4. Leaves entirely smooth. Phlox multi flora. 
4. Leaves more or less whitened by woolly, cobwebby hairs. 5. 
5. Corolla-tube much longer than the calyx. Phlox canescens. 
5 Corolla-tube about the same length as the calyx. Carpet phlox (Phlox hoodii .) 
