HYPERICACE/E. 151 



colour, and yield in acetic acid a crimson colour ; when boiled with alum, the tops 

 yield a good yellow dye ; the addition of chloride of tin to the juice gives several 

 shades of red. Combined with oil of turpentine and linseed oil, this juice also furnishes 

 an excellent red varnish, which is frequently used by upholsterers for colouring 

 woods. 



SPECIES VI— HYPERICUM DUBIUM. Leers. 

 Plate CCLXIX. 



H. quadrangulum, "Ztjm." Reich. Ic. Fl. Germ, et Helv. Vol. VI. Hyp. Tab. CCCXLIII. 



Fig. 5178. 

 H. quadrangulum, ^^ Linn." Fries. Nov. FI. Suec. ed. iL p. 237. Koch, Syn. Fl. Germ. 



et Helv. ed. u. p. 146. Gr. & Godr. Fl. de Fr. Vol. I. p. 344. 



Rootstock woody. Stem slightly woody and emitting a few 

 rootlets at the base, stout, erect, corymhosely or paniculately 

 branched, marked with 4 longitudinal elevated lines (at least 

 in the upper part). Leaves oval or oval-oblong, those of the main 

 stem slightly amplexicaul at the base; all destitute of pellucid 

 dots (or with a few on the upper leaves), and with all the 

 nerves and veins pellucid, forming a network when viewed against 

 the light, Flowers rather numerous, in compact cymes, arranged 

 in a corymb or short panicle with elongated branches. Sepals 

 (or at least the exterior ones) oval-ovate, obtuse, entire (more 

 rarely lanceolate, and with very small cartilaginous denticula- 

 tions towards the apex), and generally dotted with black glands on 

 the disk. Petals generally furnished with black dots. Styles 3, 

 about as long as the capsule. Capsule with each valve having 

 numerous vittoe on the back. 



Var. a, genuiniim. 

 Sepals broad, entire. 



Var. 3, maculatum. 



H. maculatum, Dah. (olim). 



Sepals narrow, slightly denticulate. Leaves narrower than in 

 var. a. 



In bushy places and by the sides of ditches. Eather rare, but 

 pretty generally distributed in England and the southern half of 

 Scotland. 



England, Scotland, Ireland, Perennial. Late Summer 

 and Autumn. 



This plant is frequently confounded with H. perforatum, and 

 some intermediate forms certainly occur, which have been considered 



