﻿Contributions to the Flora of Cincinnati. 



67 



diphylla in not having the continuous root-stock; the roots consisting of a 

 series of oblong tubers like those of laciniata. 



The genera Dentaria and Cardamine have, with good reason, been 

 merged into one by Bentham and Hooker. The differences between them 

 are the habit of growth and the root. In the former genus the leaves 

 are often whorled, or at least are situated near the centre of the stem, and 

 the roots are rhizomes. In the latter genus, the leaves are scattered on the 

 stem, and the roots are mostly fibrous. The flowers and fruit are almost 

 the same in both. 



In a revision of the species of the section DENTAEIA under CARDA- 

 MINE, I have suggested the following arrangement (Bot. Gaz. viii., 

 p. 206) : 



48. Cardamine diphylla, Wood. — Stem leaves two, opposite ; root-stock 

 long and continuous. 



48a. Cardamine heterophylla, Wood. — Stem leaves two to seven, 

 opposite or alternate; root-stock interrupted, of two or three toothed 

 tubers. The forms with more than three leaves are D. maxima, Nuttall. 



49. C. laciniata, Wood. — Stem leaves three, whorled; root-stock 

 nearly as in the last. 



Var. multifida, James (D. multifida, Muhl.), is a form of laciniata with 

 finely dissected leaves. I have found the two forms on Lookout Mountain, 

 Tenn. , running into each other in imperceptible gradations. 



52a. C. hirsuta, L. Var., sylvatica, Gray. Both these forms have been 

 found in our vicinity, but from some oversight they have not been previous- 

 ly recorded. 



51. C. rotundifolia, Michx. — C. purpurea, Cham. & Schlecht., was 

 inserted into the catalogue of 1879. It was intended to be the var. , pur- 

 purea, of C. rhomboidea, D C. This variety is now considered C. rotundi- 

 foHa, Michx., as above, though the description given of this species by 

 Gray is not characteristic of our form. It seldom forms runners, and there 

 are numbers of tubers mixed with the fibers of the root as in the rhom- 

 boidea. 



59a. Hesperis matron alis, L. — Found by Mr. T. W. Spurlock, in 

 Storrs Township. The stem is simple and erect ; leaves lanceolate-ovate, 

 denticulate Flowers purple; blooms from June to August. 



65a. Alyssum Lescurii, Gray, given in a former list, should be omit- 

 ted. There was a mistake in the identification. 



66. Camelina Sativa, Crantz. — This is given iu Lea's catalogue. It has 



