JO U . 



I. THE GENERA PEDILANTHUS AND CUBANTHUS 

 AND OTHER AMERICAN EUPHORBIACEAE. 



By CHAS. F. M1LLSPAUGH. 



PEDILANTHUS Neck. 



Tithymaloides Tourn. Inst., 654. 1700. 



Euphorbia sp. Linn. Sp. PL, 453. 1753. 



Pedilanthus Neck. Elem. Bot., 2:354. 1790. 



Ventenatia Tratt. Gen. PI. Disp., 87. 1802. 



Crepidaria Haw. Succ., 136. 1812. 



Hexadenia Kl. & Gke. Tricocc., 19. 1849. 



Diadenaria Kl. & Gke. ibid. 



Involucres oblique, shoe-shaped, on a slender peduncle; the tube 

 more or less fissured superiorly and notched inferiorly at the bilabiate 

 apex or throat, with two lateral and one median accessory lobes more 

 or less closing the fissure, the tube bearing an appendix on the superior 

 aspect of its posterior extremity. Appendix gibbous and interiorly 

 glandular posteriorly, its lip notched or 2-3-lobed and extending ante- 

 riorly above.the posterior end of the superior fissure of the tube. Flowers 

 pedicellate, the male numerous, ecalyculate, sometimes with linear 

 bracteoles at the base; female single with a long style, finally protruding 

 and generally declinate from the throat of the tube, stigmas 3, long con- 

 nate, often separate at the apex and frequently bi-lobed. Seeds ecarun- 

 culate. Leaves with the midrib thickened and often keeled beneath. 



Tropical American and Madagascarian shrubs with fleshy branches 

 and milky juice, alternate leaves, glandular stipules if any, opposite 

 floral leaves and cymose terminal or upper-axillary involucres. 

 Type species: Euphorbia tithymaloides Linn. 



[/ PEDILANTHUS: Involucres more or less horizontal, the tube 

 long-fissured above, shallowly notched below, 5-lobed, the two main 

 lobes much broader, the two lateral small and more or less connate 

 with the main lobes along their fissural margin, the fifth lobe partially 

 connate with the base of the lateral lobes or sometimes entirely free. 

 Appendix 1-2 or 3-lobed anteriorly, the saccate posterior portion sep- 

 arated from the floral cavity of the tube and including 2-6 small, ver- 

 rucose glands. Stems with a small stipular gland on each side of the 

 leaf attachment. 



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