634 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



18. JATEOPHA L. Sp. PI. 1006. 1753. 

 Reference: Pax in Engl. Pflanzenreich IV. 147: 21-113. 1910. 

 Trees or shrubs, often armed with stinging hairs ; leaves alternate, usually 

 long-petiolate, entire or palniately lobate, the stipules small or large and dis- 

 sected ; flowers usually monoecious, petaliferous or apetalous, usually cymose ; 

 fruit a capsule. 



A few herbaceous species occur in Mexico. 

 Flowers apetalous; plants usually armed with stinging hairs. 

 Pistillate calyx persistent as a disk at the base of the capsule. 



Leaves repand-dentate, not lobate, 2.5 to 6.5 cm. wide 1. J. palmeri. 



Leaves conspicuously lobate, usually more than 10 cm. wide. 

 Leaves lobed halfway to the base or less, the lobes entire or repand-den- 



ticulate 2. J. tubulosa. 



Leaves usually lobed more than halfway to the base, the lobes laciniate 

 or coarsely dentate. 



Lobes of the leaves merely dentate 3. J. multiloba. 



Lobes laciniate. 



Stamen column glabrous 4. J. liebm.annii. 



Stamen column villous at tlie base 5. J. polyantha. 



Pistillate calyx caducous. 



Calyx surrounded by a calyculus of slender-clavate hairs 6. J. calyculata. 



Calyx not calyculate. 



Outer filaments free 7. J. urens. 



Outer filaments imited with the others. 



Leaves not lobed 8. J. rotundifolia. 



Leaves conspicuously lobate. 



Staminodia none 9. J. kunthiana. 



Staminodia present, filiform. 



Leaves lobed less than halfway to the middle 10. J, angustidens. 



Leaves lobed more than halfway to the middle- 11. J. aconitifolia. 

 Flowers with petals; plants without stinging hairs. 

 Petals free or nearly so. 



Stipules reduced to sessile glands 12. J. andrieuxii. 



Stipules persistent, setaceous-dissected or subulate. 



Petioles with gland-tipped hairs 13. J, gossypiifolia. 



Petioles without glands. 



Leaves peltate 14. J. podagrica. 



Leaves not peltate. 



Lobes of the leaves deeply lobate 15. J. multifida. 



Lobes of the leaves merely dentate. 



Leaves shallowly lobate; cymes few-flowered 16. J. purpurea. 



Leaves deeply lobate ; cymes many-flowered, 



17. J. longipedunculata. 

 Petals conspicuously united. 



Cymes much reduced, the flowers mostly fasciculate. 

 Leaves sessile or very short-petiolate. 

 Stipules small, not dissected ; leaves glabrous or nearly so. 



18. J. spathulata. 

 Stipules large, setose-dissected ; leaves densely pubescent. 



19. J. neopauciflora. 



