Mr. Don's Descriptions of Five new Species of Pinus. 441 



which grow singly are the largest of all, being often more than a foot long, 

 lialf a foot in diameter, and weighing about four pounds. The spinous pro- 

 cesses of the scales of the cone are very strong, hooked and compressed, 3 or 

 4 inches in length, and about the thickness of one's finger, characters which 

 essentially distinguish it from P. Sahiniana, described in the 16th volume of 

 the Society's Transactions. These, together with the following species, and 

 P. pungcm of Michaux, constitute a very distinct section characterized by 

 their permanent cones, with the points of the scales elongated and spinous. 



At the suggestion of Mr. Lambert I have applied to this remarkable tree 

 the name of its discoverer, who is no less distinguished for his scientific ac- 

 quirements than for the excellent qualities of his mind. 



2. PrNUS MURICATA. 



P. foliis ternis ? strobilis insequilateri-ovatis aggregatis : squamis cuneatis 

 apice dilatatis umbilico elevato mucronatis ; baseos externse elongatis 

 ancipiti-compressis recurvato-patentibus. 



Habitat in California ad locum San Luis Obispo Hispanice dictum, alt. 3000 

 ped. Coulter, h . (v. s. sp.) 



Arhor recta, mediocris, altitudine circiter 40 pedes. Strobili aggregati (2. v. 3.), 

 insequilateri-ovati, 3-pollicares : squamis cuneatis, crassissimis, apice dila- 

 tatis, obsolete 4-angularibus, umbilico elevato mucronatis ; baseos externse 

 elongatis, ancipiti-compressis, callosis, rigidis, laevibus, nitidis, recurvato- 

 patentibus. 



This belongs to the same group as the preceding. The cones are much the 

 smallest of the section, being not larger than those of P. inops, and are remark- 

 able for the great degree of development of the scales at their external base. 



Found by Dr. Coulter at San Luis Obispo in latitude 35°, and at an eleva- 

 tion of 3000 feet above the level of the sea, from which the locality is distant 

 about ten miles. The tree is straight and rather stunted, not exceeding 40 

 feet in height. The cones grow two or three together. I regret that I have 

 not seen the leaves of this and the two following species; but it is probable 

 that, like the greater part of the American Pines, they grow in threes. 



