58 THE JOURNAL OF BOTANY 



} Euphorbia polygalcefolia Boiss. & Reut. Roadside on the way to 

 Kals from Tarragona.— \E. flavopurpurea Willk. El Fuente den 

 Simon, Malum. — \E. medicaginis Boiss. Abundant in cultivated 

 ground and on the roadside between Palma and Soller. — \E* imbri- 

 cata Vahl. var. f3. an g us ti folia Willk. Illus. ii. t. clxvi. f . ii. Roadside 

 near Pollenza. Soller Port. Abundant in cultivated ground at 

 Lluch. — \E. imbricata Vahl. var. y. parvi folia Willk. /. c, f. in- 

 Cala Mesquita. These two varieties with var. a. latifolia Willk. 

 and E. Pithyusa L. constitute a group of forms differing greatly in 

 habit, but closely related in structure. In all the forms the 

 involucral glands are semilunate, with almost obsolete cusps ; the 

 seeds are faintly rugose, mottled, and, like the surface of the entire 

 plant, are minutely papillose from the projection of the cells of the 

 epidermis. On the upper surface of the leaves the papillae are 

 hemispherical, and on the under surface and the younger parts of 

 the stem they are elongated to two or three times their diameter, 

 and are cylindrical and obtuse, giving a glaucous, minutely sha- 

 greened appearance to the plant** The leaves are coriaceous aud 

 rigid, with a strong tendency to become involute, but differ much 

 in form and size, and in the character of the margin, which vanes 

 from entire to erose or strongly dentate. The forms may be 

 arranged as follows f 



A. Plant erect, attaining 30-40 cm., with long branches and 

 loosely imbricated leaves: — 1. Leaves obcuneate oblong, 25- 

 30 mm. x 10-12 mm., closely or obsoletely serrate in the upper 

 half = E. imbricata var. a. latifolia Willk. 2. Leaves lanceo- 

 late or obovate-lanceolate, closely serrulate or subentire m."* e 

 upper half, 12-20 mm. x 3-5 mm. = var. (3. angustifolia\Viu** 



B. Plant erect or decumbent, 10-30 cm., with short crowded 

 branches and densely imbricated leaves : — 1. Stem and branches, 

 or at least the branches, erect, ttout ; leaves lanceolate, acute, 

 entire, 15 mm. x 4-5 mm. = E. Pithyusa L. 2. Stem de- 

 cumbent or ascending, slender, much branched from the base , 

 leaves obovate-oblong or obcuneate, obtuse or truncate, niucro- 

 nate, strongly serrate-dentate at the apex == var. y. pamfow 

 Willk. 



A plant gathered by Mr. Clarence Bicknell as E. Pithyusa on the 

 coast at Calcatoggio, Corsica, has elliptic, acuminate, eroso-dentate, 

 flat leaves, 15 mm. x 7 mm., which are of a thinner texture, an 

 show the veins ; it would be better placed near E. imbricata var* 

 latifolia, as in E. Pithyusa the leaves appear to be always entire, 

 with involute margins. A specimen of E. Pithyusa var. proce^ 

 G. & G. (E. bonifaciensis Req.) in the herbarium of Mr. J. *• 

 White, from Bonifacio, Sardinia, has acute entire leaves, 21 mm. * 

 5 mm., and resembles E. imbricata var. lanceolata. Grenier an 



v uiiu., «xivx AcaeiiAuieB &• %mvrtcaia var. cayic-ei/fMcu. ^*~ — , 



Godron's description of this variety is : " Upper cauline leaves ova 



* In E> nicceensis also the leaves are papillose, but the papillae are conic 

 and acute, and give the plant a softer, more velvety appearance. . r0fll 



t The descriptions and measurement of the leaves are partly taKen 

 Willkom. Illus. ii. p. 129. 



al 



