JOHNSON: A REVISION OF THE SECTION BORAPHILA 7 



The differences between the mature follicles of these two sections are also 

 pronounced (Plate II). 



The criteria of classification described above are therefore regarded as 

 fundamental, for the reason that they are fixed and quite obvious characters 

 that clearly define the limits of the relationships. 



Key to the Sections 



I. Hairs uniseriate 



A. Ovary wholly superior ; carpels more or less united 



a. Carpels elliptic or oblong at maturity 



1. Gland a fleshy basal collar; follicles erect, united to the middle or merely 

 at the base Section Hydatica 



2. Gland a broad zone around the basal portion of the carpels; follicles dis- 

 tinct, spreading Section Calthophyllum 



b. Carpels forming a V-shaped capsule at maturity; gland fleshy, surrounding 

 the carpels to near the middle Section Aulaxis 



B. Ovary subinf erior ; carpels distinct, connected by the adnate receptacle 



a. Carpels two 



1. Gland a fleshy ring close to the base of the carpels and the calyx; recep- 

 tacle shallow to deeper, flabellate Section Dermasea 



2. Gland a broad fleshy disc; receptacle deep 



(a) Gland closely appressed to the base of the calyx 



Section Chionophila 



(b) Gland considerably elevated, thick, convoluted, its margin persisting 

 as a distinct flange Section Micranthes 



b. Carpels three, sometimes four; gland a broad fleshy disc slightly elevated 



above the base of the calyx, and its margin persisting as a flange 



Section Tricarpum 



II. Hairs multiseriate ; ovary superior ; carpels united to the middle 



A. Gland a narrow girdle above the base of the carpels; carpels elliptic at matu- 

 rity .; Section Arabisa 



B. Gland a broad fleshy zone surrounding the ovary; carpels (capsule) pyrifonn 

 at maturity, strongly contracted above Section Heterisia 



Section Hydatica Tausch, Hort. Canal. Fasc. 1. 1823. 



Rohertsonia Haw., Syn. PL Succ. 321. 1812, as genus; in part. 



Gymnopera D. Don, Trans. Linn. Sec. 13 :343. 1822; in part. 



Micranthes D, Don. I.e. 



Arahidia, Seringe, DC. Prodr. 4:40. 1830; in part. 



Boraphila Engler, Verh. Zool.-Bot. Ver., Wien. 19:522. 1869; in part. 



Ovary wholly superior ; carpels conical, at length bottle-shaped, at matu- 

 rity erect, stout to slender, united up to the middle or merely as high as the 

 gland; beaks short and stout with thick stigmas, or elongated and some- 

 what recurved, with small stigmas; fruit a capsule; gland a fleshy collar 

 surrounding the base of the carpels; filaments clavate; sepals reflexed 

 (Plate I). 



