138 FLORA OF TEXAS. 



none. Achenia 4-angled. Seed erect. Leaves simple, 

 lobed. 



Tribe III. Ranunculeae. Sepals imbricated in the 

 bud, mostly herbaceous. Petals manifest. Ovtdes soli- 

 tary. Fruit an achenium. Herbs. Leaves alternate. 



7. Myosurus. Sejmls spurred at the base. Achenia 

 spiked. Leaves radical, linear. 



8. RANUiTCULUS. Sepals spurless. Achenia capitate. 

 Stems leafy. 



Tribe IV. Helleborineae. Se2mls imbricated in the 

 bud, colored. Petals of various forms or none. Fruit a, 

 1-many-seeded follicle. Leaves alternate. 



9. Caltha. Petals none. Follicle many-seeded. Sepals 

 yellow. Leaves simple. 



10. IsoPYRUM. Petals none. Follicle few-seeded. Se- 

 pals white. Leaves compound. 



11. Aquilegia. Sepals 5, regular. Petals 5, spur-shaped, 

 hollow. Follicle many-seeded. Leaves compound. 



12. Delphii^um. Sepals 5, irregular; the outer one 

 spurred. Petals 4, small ; two of them spurred, the others 

 stalked. Follicle many-seeded. Leaves lobed. 



13. Acoi^iTUM. Sepals 5, irregular ; the outer one large, 

 hooded, and enclosing two long-stalked, hooked petals; the 

 other petals stamen-like or wanting. Follicle many-seeded. 

 Leaves lobed. 



14. Zakthorhiza. Flowers regular. Sepals and petals 

 5; the latter 2-lobed. Follicle 1-2-seeded. Shrubby. 

 Leaves compound. 



Tribe V. Cimicifugeee. Sepals imbricated in the 

 bud, colored. Petals small and flat, or none. Fruit a 

 follicle or berry. Herbs. Leaves alternate. 



15. Hydrastis. Petals none. Ovaries numerous, form- 

 ing a head of 1-2-seeded berries. Stems 1-flowered. Leaves 

 simple, lobed. 



