308 CONTUIBUTIONS FROM THE NATIONAL HERBARIUM. 



5. Sedum lenophylloides Rose, Contr. U. S. Nat. Herb. 13: 298. 1911. 

 Tamaulipas and Nuevo Leon ; type from Monterrey. 



Low shrub, about 30 cm. high; leaves 1 to 1.5 cm. long, pale, often purplish. 



6. Sedum tortuosum Hemsl. Diag. PI. Mex. 10. 1878. 

 Described from Mexico, the locality not known. 



Low glabrous shrub with thick branches; leaves 2.5 cm. long. 



7. Sedum retusum Hemsl. Diag. PI. Mex. 51. 1880. 

 San Luis Potosf. 



Low glabrous shrub ; leaves sessile, 1 to 1.5 cm. long. 



52. HYDRANGEACEAE. Hydrangea Family. 



Reference: Small & Rydberg, N. Amer. Fl. 22: 1.59-178. 1905. 

 Trees or shrubs, rarely scandent ; leaves opposite, estipulate, entire or 

 dentate; flowers perfect, often large and showy; sepals and petals 4 or 5 each; 

 stamens 8 to many ; fruit a capsule. 



Capsule ovoid, the beaks arising gradually from the body. 

 Filaments not appendaged ; sepals and petals each 5 ; stamens 10. 



4. FENDLERELLA. 

 Filaments appendaged under the anthers; sepals and petals each 4; sta- 

 mens 8 5. FENDLERA. 



Capsule urceolate or obovoid, the beak or beaks rising abruptly from the body. 

 Petals valvate, very small ; stamens 8 ; inflorescence involucrate. 



1. HYDRANGEA. 

 Petals convolute or imbricate, large; stamens 12 to 60; inflorescence not in- 

 volucrate , 2. DEUTZIA. 



Capsule subglobose; petals imbricate. 



Capsule obovoid or obconic; petals convolute 3. PHILADELPHUS. 



1. HYDRANGEA L. Sp. PI. 397. 1753. 

 1. Hydrangea oerstedii Briq. Ann. Cons. Jard. Geneve 20: 407. 1919. 



Cornidia radiata Oerst. Nat. For. Kjobenhavn Vid. Medd. 1856: 42. 1856. Not 

 Hydrangea radiata Walt. 1788. 



Reported from Veracruz and the Sierra Madre. Costa Rica and Panama. 



Scandent shrub ; leaves oblong or oblong-elliptic, about 12 cm. long and 6 

 cm. wide, leathery, petiolate, obtuse, entire or nearly so, almost glabrous; 

 flowers small, pink, cymose, the inflorescence covered with large rounded bracts 

 before expansion ; petals 2.5 mm. long. 



The identification of the Mexican specimens is doubtful, but they probably 

 belong here. They have been reported as Hydrangea peruviana Moric. and as 

 Cornidia peruviana (L.) Small. 



Hydrangea opuloides Koch. (H. hortensia DC), the common cultivated hy- 

 drangea, native of China and Japan, is gi-own in Mexico under the name " hor- 

 tensia." 



2. DEUTZIA Thunb. Nov. Gen. 1: 19. 1781. 



Shrubs, the pubescence of stellate hairs ; leaves deciduous, shallowly dentate, 

 petiolate; flowers small, white, cymose. 



Most of the species of the genus are natives of eastern Asia, and some are 

 cultivated for their showy flowers. The Mexican species have been placed in 

 a separate genus, Neodetitzia, by Small, but they differ in no important respect 

 from the Old World forms. 

 Petals 5 to 6 mm. long 1. D. mexicana. 



