302 PLANT NAMES AND SYNONYMS 



1660. PONTEDERIA, L. Pickerel- weed. Poiitederiaceae. 



Named for Prof. G. Pontedera of Padua, d. 1767. Aquatic 

 herbs with spikes of bkie flowers. About 8 species, New World; 

 1 in U. S. 



1651. PONTHIEVA, E. Br. Ponthieva. Orcbidaceae. 



Terrestrial orchids. About 15 species, New World; 1 in U. S. 



1652. p6pULUS, L. Poplar, Aspen, etc. Salicaceae. 



The classical Latin name, whence our word "poplar" . Trees 

 with soft wood. About 25 species, northern hemisphere, es- 

 pecially in higher latitudes; 11 in U. S. 



a. P. alba L. Europe and Asia, nat. in U. S. Abele (Abel, 



Arbell, Awbel, Abbey), Silver Poplar (Popple), Silver-leaf or 

 White Poplar, Aspen Poplar, Great Aspen, White Asp, Dutch 

 Beech, E-attler tree, White-bark. 



b. P. balsamifera L. British America and northern part of U. S. 



Balsam Poplar, Tacamahac. A variety, P. balsamifera candi- 

 cans (Ait.) A. Gray, is known as Balm-of-Gilead. Leaf-buds 

 resinous, aromatic, expectorant. 



c. P. deltoides Marsh (P. Carolinensls Moench, P. monilefera 



Ait., P. angulata Ait., P. Canadensis Desf.). Canada, south to 

 Florida and New Mexico. Cottonwood, Necklace Poplar, 

 Carolina Poplar, Yellow Cottonwood, Big Cottonwood, Cotton- 

 tree, Italian Black Poplar, Carolina Poplar, Kiver or Water 

 Poplar, Berrv-bearing Poplar. (d) P. beteropbylla L. in 

 the eastern States and (e) P. acuminata Rydb. also (f ) P. 

 aug'ustifolia James, in the west are also called Cottonwood, 

 (g) P. tricbocarpba T. &G., California to Alaska, is called 

 Black Cottonwood or Balsam Cottonwood. 



h. P. Eiipbratica Olivier. Northern Africa, east to Thibet and 

 southern Siberia. Garab tree of the Arabs. The "willow" of 

 Scripture (Ps. 137). 



i. P. tremuloides Michx. British America, south to Kentucky, 

 New Mexico and California. American Aspen (Asp, Aps, 

 Espen, Haspen), Mountain Asp, Quaking Asp, Auld-wive's- 

 tongues, Trembling Poplar, Quiver-leaf, White or American 

 Poplar. The Aspen of Europe, to which most of the above 

 names were originally applied, is (j) P. tremiila L. The 

 Great Aspen or Large-toothed Asj)en of the eastern U. S. is (k) 

 P. graudideutata Michx. 



1. P. nigra L. (including P. dilatata Ait.). Europe. Black 

 Poplar (Pipple, Popillary, Pepillary), Cat-foot Poplar, Old 

 English or Willow Poplar, Cotton-tree. The variety Italica 

 Du Boi (P. fastigiata Desf. ) is the well-known Lombardy Pop- 

 lar, called also Black-lady or Water Poplar. 



1653. PORLIERIA, R. &Pay. (Porliera). Zygopbyllaceae. 



Named in honor of a Spanish botanist. Syn. Guaiacum, in 

 part. Shrubs or trees with pinnate leaves. Two species, tropi- 

 cal America; 1 in U. S., viz. (a) P. aug'ustifolia (Engelm. ). 

 Texas to Mexico. Wood has properties of Guaiacum q. v. 



