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 316 BLENNODIA.

Cruciferarum genus, prope Matthiolam.

—Calyx clausus, foliolis lateralibus basi saccatis. Petala æqualia, laminis obovatis. Stamina: filamentis edentulis. Ovarium lineare. Stylus brevissimus. Stigma bilobum dilatatum. Siliqua linearis valvis convexiusculis, stigmate coronata, polysperma. Semina aptera pube fibroso-mucosa tecta! Cotyledones incumbentes.

Herba (v. Suffrutex) erecta ramosa canescens, pube ramosa; foliis lato-linearibus remotè dentatis; racemis terminalibus.

1. canescens.

In arenosis depressis.

Suffruticosa, sesquipedalis, caule ramisque teretibus. Folia vix pollicaria paucidentata. Racemi multiflori, erecti, ebracteati. Flores albicantes. Calyx incano-pubescens. Petalorum ungues calyce paulo longiores. Stamina 6, tetradynama, filamentis linearibus membranaceis apice sensim angustato.

This plant has entirely the habit, and in many important points the structure of Matthiola, near which in a strictly natural method it must be placed; differing, however, in having incumbent cotyledons, and in the mucous covering of its seeds. The mucus proceeds from short tubes covering the whole surface of the testa, each containing a spiral fibre which seems to be distinct from the membrane of the tube. A structure essentially similar is known to occur generally in several families; to what extent or in what genera of Cruciferæ it may exist, I have not ascertained; it is not found, however, in those species of Matthiola which I have examined.