TREES AXD SHRUBS. 

 PINUS LUMHOLTZII, Robdts. & Femt. 



Pinus Lumholtzh, Robinson & Fernald, Proc. Am. Acad. Sci. xxx. 122 (1894) -Mtttwi 

 Jour. Linn. Soc. xxxv. 591. v '" iUdbters > 



Pinus patula, Seemann, Bot. Voy. Herald, 336 (not Schlechtendal & Chainisso) (1852- 

 1857). — Hemsley, Bot. Biol. Am. Cent. iii. 189 (Seemann No. 1961). 



Leaves serrate, in fascicles of threes, from 2 to 3 decimetres in length, pendent, their sheathl 

 loose, long, chestnut-brown, lustrous, deciduous after the first season; resin ducts medial and 

 internal; hypoderm in a single or double row of thick-walled cells detached from the epidermis 

 by a layer of thin-walled cells; fibro-vascular bundles double and contiguous or often merged in 

 one. One-year-old cones subterminal and lateral on younger trees, usually subterminal on older 

 trees, long-stalked, their scales tumid and armed with weak prickles. Mature cones on curved 

 peduncles from 4 to 7 centimetres long, pendent, symmetrical or slightly oblique, ovate-conical or 

 nearly cylindrical, early deciduous, the apophyses tumid, sublustrous, ochre-brown, the umbo often 

 apparently double from a dark border. 



A round-headed tree, about 15 metres high, with long thin branches, slender drooping chestnut- 

 brown more or less pruinose branchlets, their bark separating during a few seasons in thin 

 scales, finally becoming more persistent and forming rough ridges even on young stems. 



Mexico : Western Sierras, B. Seemann, 1849 (No. 1961), C. V. Hartman, Coloradas, Chihuahua, 

 1893 (No. 541); J. N. Rose, Santa Teresa, Tepic (No. 2194); Plateado, Zacatecas (No. 2989); 

 Bolanos, Jalisco (No. 3083), Mesquitec, Jalisco, 1897 (No. 3586), E. W. Nelson, San Sebastian, 

 Jalisco, 1897 (No. 4112), C. G. Pringle, Etzatlan, Jalisco, 1905 (No. 10014), G. R. Shaw, Etza- 

 tlan and Ferraria de Tula, Jalisco, 1905. 



The foliage of this remarkable Pine is absolutely pendent, not drooping in easy curves like the leaves of Phi us 

 patula, Schlechtendal & Chamisso, or Pinus excelsa, Wallich, but hanging as if lifeless and artificially attached to the 

 branches, producing an effect best described by the popular name of this species in southern Jalisco, " Pino barba 

 caida." The abrupt drooping of the leaves is caused by the weak tissues which underlie the sheaths ; as a result of 

 this the bright chestnut sheaths are brought into nearly perfect alignment and form a conspicuous border to the green 

 foliage masses of the first season. The contrast between the younger foliage and the sheathless leaves of the foliage in 

 its second year is so marked that the two growths are easily distinguished at some distance from the tree. From the 

 examination of a stump at Tula this species appears sometimes to produce, like Pifius rigida, Miller, and Pinus 

 leiophylla, Schlechtendal & Chamisso, shoots from adventitious buds. 



Pinus Lumholtzii is confined to the western Sierras of Mexico, occupying about ten degrees of latitude. Dr. 

 Lumholtz first observed it at Tutuhuaca, about the latitude of theCSty of Chihuahua, and it has been collected in southern 

 Jalisco. The first specimen, as far as I know, is Seemann's jS t o. 1961 in the Kew Herbarium, collected during the 

 voyage of the Herald in 1849 and labeled with the indefinite locality « N. W. of Mexico." A few of Seemann's cones 

 are in the collection of the Arnold Arboretum. Our knowledge of this Pine is due to the collection made by C. V. 

 Hartman of the Lumholtz Expedition. There is a portrait of the species in Lumholtz's Unknown Mexico (i. 408), and 

 in his article in Scribner's Magazine (xvi. 38). According to Lumholtz it is one of six species of Pine known to 

 the Tarahumare Indians, who use an infusion of the leaves for a stomachic and its wood in the manufacture of their 



George Russell Shaw. 

 Arnold Arboretum. 



