UMBELLIFEKvE. 129 



the permanent diverging styles. Seeds minute, usually in- 

 definite ; albumen fleshy. Shrubs, with opposite simple leaves. 

 Flowers usually in cymes. 



HYDRANGEA. Linn. Hydrangea. 



(From the Greek v&up water, and ayysiov, a vase ; in allusion to the form of the 

 capsule.) 



Marginal flowers usually sterile. STERILE FL. Calyx mem- 

 branaceous, colored, veiny, 4 5-parted. Petals, stamens, and 

 pistils rudimentary or none. FERTILE FL. Calyx hemispheric, 

 adnate to the ovary, 5-toothed. Petals 5, ovate. Stamens 10. 

 Styles 2. Capsule 2-celled, opening by a foramen between the 

 styles. Seeds numerous. 



1. H. arborescens Linn. : leaves ovate or oblong-ovate, acuminate, obtuse 

 or subcordate at base, toothed, smoothish; flowers in fastigiate cymes. 

 H. vulgar is Mich. 



Sandy banks. Penn. to Geor. W. to Miss. July. ^ -Stem 4S feet high. 

 Leaves large, the veins pubescent Flowers white or yellowish- white, varying 

 from all fertile to all sterile and radiate. Tree Hydrangea. 



2. H. radiata Walt. : leaves ovate, mostly cordate, acuminate, serrate, 

 white tomentose beneath ; flowers in fastigiate cymes, some of the marginal 

 ones radiate and sterile. H. nivea Mick. 



Penn. to Geor. Muhl. Tenn. May, June, fy. Stem 6 8 feet high. Flowers 

 large, white, very ornamental. Changes by cultivation. Rayed Hydrangea. 



ORDER LX. UMBELLIFER^E. UMBELLIFERS. 



Calyx entire or 5-toothed. Petals 5, usually inflexed at the 

 point. Stamens 5, alternate with the petals. Ovary inferior, 

 2-celled ; styles 2, distinct ; stigmas simple. Fruit consisting 

 of two carpels, which are attached to a common axis by their 

 face (the commissure) from which they separate when ripe ; 

 each carpel traversed by several ribs or wings ; in the inter- 

 vening spaces (intervals) are often lodged longitudinal channels 

 or receptacles (vitta), containing colored oily matter. Seeds 

 usually adhering to the carpel; albumen copious, horny. 

 Herbaceous plants with hollow stems. Leaves mostly com 

 pound and sheathing at base. Flowers in umbels. 



SUBORDER I. 



Albumen flat or flattish on the face. 

 6* 



