56 PROCEED[NGS OF THE ACADEMY OF [1889. 



The author confines himself in this paper to those forms of scor- 

 pioidal inflorescence, that are not usually considered in connection 

 with the subject, and which evidently occur by the twisting of the 

 spiral growths. Those forms of unilateral inflorescence, more prop- 

 erly regarded as scorpioidal, and treated at some length in Gray's 

 Botanical Text Book, Sixth Edition, page 163, would have to be 

 examined from a different stand-point. 



Note on Pinus pungens and its allies. Until comparatively few 

 years ago, the Table Mountain Pine, Pinus pungens Mx., was not 

 found north of the Potomac. Professor Porter found old cones at 

 Huntingdon, Pennsylvania, and an aged local botanist at Bethlehem 

 in the same State, told the author of this, that he had found old 

 cones there. Since then the author found living trees in abundance 

 at Port Clinton, subsequently in Dauphin County, near Harrisburg, 

 and in January of this year near Lewistown in Mifflin County. It 

 is safe to say it is found in the whole Allegheny range through the 

 breadth of the State. 



It is remarkable that a tree so widely scattered in this region 

 should have been so long overlooked, and that the only person re- 

 ported as having collected it in a living condition, should be the 

 writer. 



An interesting fact is that in all the Pennsylvania localities it 

 seems to be found only in the upper Silurian formation 



In the recently discovered Lewistown locality the rock is 

 fossiliferous, being full of the casts of Brachiapodic shells. It is just 

 possible it may reach the lower Devonian formation. 



Another interesting point is that at Lewistown all five of the 

 Pennsylvania species of the true Pines, are growing together : Pinus 

 Strobus, P. mitis, P. inops, P. rigida, and P. pungens. P. Strobus 

 and P. mitis make fine trees ; some of the latter taller, and four 

 feet in circumference. 



One of the distinctive features of the species of Pine, and which 

 cannot often be described among their specific character, is their 

 habit of growth. By this they can be distinguished at a distance. 

 Pinus pungens in this respect is seen to be more closely related to 

 Pinus rigida, than to any of its neighbors. The side branches often 

 branch and re-branch in Pinus rigida, taking on in this respect the 

 character of a deciduous tree. Besides this the spurs, which in all 

 pines are at the base of the fascicles of leaves growing towards the 



