MR. G. S. BOULGER ON" THE PERFOLIATE PENNY-CEESS. 183 



minute squamiform leaves. These leaves therefore subtend two 

 buds, one of which grows into a leaf-like deciduous branch, and 

 the other remains dormant unless required to produce a perma- 

 nent branch. The deciduous branches have in some species the 

 form of a pinnate leaf, as in the above mentioned, or may in some 

 cases be supra-decompound, as, for instance, Phyllanthus Conami, 

 The foregoing has, I think, some interest, as bearing on the 

 morphology of leaf and stem. In Dr. Masters's * Vegetable Tera- 

 tology,' p. 4/9, it is said that the two organs may be spoken of as 

 morphologically identical. It is important to observe that the 

 fall of a flower or inflorescence is equal, morphologically, to the 

 fall of a branch, all the parts of the flower representing leaves. 



DESCRIPTION OF PLATE III. 



Fig. 1. Part of the stem, with portion of the branches and a leaf of Castilloa 



elasHca, of natural size. Drawn from a specimen growing iu theEoyal 

 Gardens, Kew. The following lettering (except where otherwise given) 

 applies to this and the succeeding figures: — br, branch; hd, dor- 

 mant buds; sr, scars remaining after the disarticulation of the lateral 



branches ; I s, scars of the fallen leaf. 

 Fig. 2 is the lower portion of stem or continuation of fig. 1 ; and shows the scar 



of earliest fallen and lowest branch with the scar of its subtending leaf. 

 Fig. 3. A segment of the stem of another and larger specimen of Caatilloa elas- 



tica, showing branch and leaf-scar, of natural size. 

 Fig. 4. Enlarged view, part of stem of fig. % showing leaf-scar in a different aspect. 

 Figs. 5 and 6. A profile and end view, showing the articular surface of a fallen 



branch of Castilloa elastica, slightly enlarged. 

 Fig. 7. Angle of junction of a stem and branch o{ Phyllanthns jvglandifolius; 



d, scale-like leaf. * 

 Fig. 8. A poj'tion of the stem, branches, leaves, and flowers of Phi/Uanthu$ 



(Reidia) fflauccaceus: bd, hud growing into permanent branch sub- 

 tended by deciduous branch-bearing flowers ; si, scale-Uke leaf. Also 

 from a plant growing at Kew and sketched of about nat. size. 



Eemarks on the Distribution of the Perfoliate Penny-Cress 

 {Thlaspi perfoliafum, Linn.) in Britain. By George S. 



BouLGER, Esq., F.L.S., P.G.S. 



[Eead May 3, 1877.] 



The insignificant little Crucifer a few notes on whicli I wish to 

 lay before the Society, derives its chief interest to us from its very 

 limited area of distribution in Great Britain. 



