1920] SWINGLE, NEW SPECIES OF PISTACIA 107 



Leon 



different from the true Pistacia mexicana HBK. of southern Mexico. 



Thanks to this wealth of material of both the southern Mexican and the 

 Texas Pistaches, I am now convinced that the Texas plants constitute a 

 good species, for which I propose the name Pistacia texana, n. sp. 



Pistacia texana, n. sp. 



Pistacia foliis subpersistentibus, foliolis plus minusve curvatis, obtusis, 

 submucronatis, subspathulatis; fructibus maturis profunde rubro-brunneis. 



Species affinis P. mexicanae sed foliis minoribus, foliolis paucioribus, plus 

 minusve curvatis, plus minusve spathulatis, latioribus obtusioribusque, mi- 

 nus mucronatis; ramulis novellis minus pubescentibus ; alabastris bracteis- 

 que minoribus et minus pubescentibus; fructibus maturis rubro-brunneis 

 nee atro-purpureis et glaucescentibus; trunco fere e basi ramoso (non trunco 



simplice). 



Leaves persistent or tardily deciduous, odd-pinnate, 5-10 cm. long and 

 2.5^.5 cm. broad, usually 6-8 cm. long and 2.5-3.5 cm. broad; petiole 10-15 

 mm. long, or sometimes 20 mm. on male trees, flattened and very narrowly 

 winged; rachis very narrowly winged, slightly pubescent above; leaflets 

 4-9, usually 5-8 pairs, often not strictly opposite, thin and netted-veined, 

 8-25 mm. long and 5-9 mm. bi'oad, usually 12-20 mm. long and 6-8 mm. 

 broad; mature leaflets broadly rounded, more or less Spatulate, or more or 

 less mucronate at the tip (half-grown leaflets wine-red, acute-lanceolate, 

 acute at tip) tapering into a deltoid or subcuneiform base; lateral leaflets 

 more or less curved and inequilateral; midrib usually much nearer the side 

 of the leaflet toward the parent twig; and usually more or less curved with 

 the concave side toward the parent twig; leaflets dark green and sparingly 

 pubescent along midrib above, pale green and glabrous below; almost ses- 

 sile (except the terminal leaflet which is narrowed into a petiolule 4-6 mm. 

 long) margin entire, slightly recurved. Female inflorescences appearing 

 just before or with the new leaves, loosely and simply paniculate, 4-6 or 

 sometimes 7 cm. long, almost glabrous. Female flowers small, usually sub- 

 tended by a small ciliate margined bract and two similar bractlets, all three 

 usually wine-red at the tips; perianth none; ovary ovate or sub-globose; 

 styles 3, two shorter ones with 2-lobed stigmas, one, the longer, with a 3- 

 1^1 — 1 „4.: — r. i\ToU ,"T.flr>,-ooo<»nr><»o in f»nmr»firt nanicles. 2-4 cm. long, much 



very 



as 



the flowers and branches of the panicles. Fruits lenticular to oval, dark 

 reddish brown and slightly glaucescent when ripe, 5-6 mm. long, 4-5 mm. 

 broad and 2.5-3 mm. thick, usually containing no embryo. Young twigs 

 slender, 1.5-2.5 mm. thick, slightly pubescent, reddish colored when young, 

 grayish brown when one year old from scaling off of the white cuticle; 

 flower-buds smaU, 1.5-2.5 mm. long, sparingly pubescent. 



A small tree or a large shrub, usually branched from the base, 5-10 m. 

 high with a spread of 5-10 or rarely 12 m. Diameter of largest trunks 



