EVENING PRIMROSE FAMILY 165 



15. GALPINSIA Britton. 



Whole plant strlgose-cinereous. 1. G. lavandulaefolia. 



Stem and hypanthium more or less hirsute. 2. G. interior. 



16. MERiOLIX Raf. 



Throat of the hypanthium dark purple within, 5-6 mm. broad at the mouth, 



1. M. melanoglotlis 

 Throat of the hypanthium orange within, sometimes with a darker ring at the base of 

 the stamens, Z-i mm. broad at the mouth. 2. M. serrulala. 



17. TARAXIA Nutt. 



Leaves entire or merely toothed. 1. T. subacaulis- 

 Leaves pinnatiSd. 



Hypanthium 2-5 cm. long; petals wbout 5 mm. long. 2. T. breviflora. 



Hypanthium 6-10 cm. long; petals 10-14 mm. long. 3. T. longiflora. 



18. SPHAEROSTIGMA F. & M. 

 Corolla yellow, turning reddish or greenish. 



Capsule fusiform. 1. S. andinum. 



Capsule linear. 



Leaves narrowly linear. 



Plant glabrous, or nearly so. 



Pods straight, erect. 4. S. parvulum. 



Pods curved, often reflexed. 5. ,3. flexuosum. 



Plant more or less pubescent, at least when young. 



Plant strigillose; leaves usually dentate. 6. S. strigulosum. 



Plant hirsutuious below, often glandular above; leaves usually entire, 

 Unear. 8. S. pubens. 



Leaves oval, lanceolate, or oblong. 

 Petals 1-2 mm long. 



Plant dwarf, only a few centimeters high, strigillose; capsule about 2 cm. 



long. 9. S. minus. 



Plant taller, 1-4 dm. high, often viscid above; capsule about 5 cm. long. 



11. S. chamaenerioides. 

 Petals 5-6 mm. long. 13. S. alyssoides. 



Corolla white to ochroleucous or rose-colored. 



Capsule enlarged at the base, tapering upwards ; bark shreddy. 



Plant glabrous; leaf-blades oblanceolate. 2. S. decorticans. 



Plant more or less glandular; leaf-blades ovate. .3. S. Booihii. 



Capsule scarcely enlarged at the base, cylindric; plant pubescent; bark not shreddy. 

 Plant strigose or puberulent. 



Leaves linear. 7. S. refractum. 



Leaves elliptic, spatulate or lanceolate. 



Petals 1-2 mm. long. 10. S. tortum. 



Petals 5-6 mm. long. 12. S'. alyssoides. 



Plant villous. 



Leaf-blades 3-5 cm. long, obovate, sparsely villous; petals 7-8 mm. long. 



13. iS. macrophyllum. 

 Leaf-blades 1-2.5 cm. long, densely villous; petals 3-5 mm. long. 



14. iS. utahense. 



19. CHYLISMIA Nutt. 



Flowers axillary; delicate plant 1 dm. high or less. 1. C. pterosperma. 



Flowers in terminal racemes or panicles. 



Leaf-blades simple, sinuate or entire, or pinnate with the lower leaflets much reduced. 

 Plant glabrous, puberulent, minutely strigose, or glandular. 



Petals 3-5 mm. long; leaves glabroxis. 2. C. scapoidea. 



Petals 7-10 mm. long; leaves grayish-strlgose when yoimg. 3. C. cruciformis. 

 Plant more or less hirsute or vllloxis, with long white hairs. 



Leaves simple or with a few (1 or 2 pairs, rarely more) small lobes on the 

 petioles; leaves and stem sparingly hairy. 

 Petals 10-12 mm. long; pod linear, 5-6 cm. long. 4. C. brevipes. 



Petals 2-7 mm. long; pod clavate, less than 1.5 cm. long. 



Petals 6-7 mm. long. 5. C. Parryi. 



Petals 2-5 mm. long. 



Petals 4-5 mm. long; stem tall, 3 dm. high or more, branched. 



6. C. tenuissima. 

 Petals 2-3 mm. long; stem low, about 1 dm. high, simple. 



7.. C. Walkeri. 

 Leaves interruptedly pinnate, with several leaflets. 



Petals 8-10 mm. long; leaves and lower part of the stem densely hairy. 



8. C. venosa. 

 Petals 4-6 nmi. long; leaves and stem sparingly hairy or glabrate. 



9. C. parviflora. 

 Leaves interruptedly pinnate, the larger alternate pairs 12 or more, not reduced. 



10. C. multijuga. 



20. STENOSIPHON Spach. 1. S. Hnifolium. 



21. GAURA L. BuTTERPLY Weed. 



Anthers oval, attached near the middle; fruit fusiform, sessile, almost equally 8-ribbed. 



1. G. parviflora. 



