88 



HARPER 



live on the other side of the creek, where purple flowers are much 

 more numerous. 



As usual, the modes of dissemination are not known for more 

 than half the species. About 17 species have wind-borne seeds, 

 and 1 5 fleshy fruits. Some of the latter are berries which can only 



Jan. Feb. Mar. April May June July Aug. Sept. Oct. Nov. Dec. 



40 



30 



20 



10 



1 _ -*■--, i ' 7 \ ' I "* 



r-- { '~r~ J 1 1 \ 1 r\--i v 



1 , pj. ._- , ' , i-i-l ' 



40 



30 



20 



10 



Fig. 12. 

 Phonological diagram for 120 sand-hill plants, including 20 trees and shrubs. 



be reached by birds, while others are larger fruits close to the 

 ground for the benefit of terrestrial animals. Nine or ten species 

 are "tonoboles" (see p. 61) and about the same number have 

 adhesive fruits. A few of the Leguminosas have pods which 

 open suddenly with a twisting motion, and expel the seeds in 

 that way. One of these, Clitoria Mariana, has sticky seeds 

 which are probably adapted to adhere to any animal which may 

 be passing at the time they are discharged. There are at least 

 four tumble-weeds in the list. 



The list contains 133 species belonging to about 103 genera 

 and 45 families (a larger number of genera and families than 

 in the dry pine-barrens, but a smaller number of species). The 

 largest family is Leguminosae, with 22 species, and the next 

 Compositae, with 16. Euphorbiaceas, Cyperaceae, and Gramineae 

 tie for third place, with seven each. The Gentianaceae and 

 Polygalaceae are conspicuous by their absence. The largest 

 genera are Euphorbia and Quercus, with four species each. 

 Cryptogams are represented by two pteridophytes, one moss, 



