STANDLEY TREES AND SHRUBS OF MEXICO. 733 



umbels, the pedicels hairy ; petals often hirtellous ; fruit black. " Palo huaco 

 (hueco ?)" (San Luis PotosI, Palmer), 



Palmer reports that in San Luis PotosI an infusion of the stems in " aguar- 

 diente " is used as a remedy for stomach troubles. The species has been re- 

 ported from YucatS,n, where it is said to bear the Maya name " xtab-canil." 



DOUBTFUL SPECIES. 

 Cissus MEXicANA DC. Prodr. 1: 631. 1824. Described from Mexico; said to 

 haev 5 leaflets, and perhaps a synonym of Parthenocissus quinqiiefolia. 



4. AMPELOCISSUS Planch, in DC. Monogr. Phan. 5: 368. 1887. 

 1. Ampelocissus acapulcensis (H. B. K.) Planch, in DC. Monogr. Phan. 5: 



403. 1887. 



Yitis acapulcensis H. B. K.-Nov. Gen. & Sp. 7: 230. 1825. 



? Ampelocissus erdwendiergii Planch, in DC. Monogr. Phan. 5: 404. 1887. 



Sinaloa to Guerrero and Morelos ; type from Acapulco, Guerrero. El Sal- 

 vador. 



Large vine; leaves broadly cordate, 7 to 16 cm. long, acute, erose-dentate, 

 angulate or often shallowly 3-lobate, densely ferruginous-tomentose beneath, at 

 least when young; flowers dioecious, the staminate in very dense cymes about 

 8 cm. broad, the branches densely tomentose; petals red, glabrous; fruit wine- 

 colored, with a bloom, 12 to 25 mm. in diameter. " Uva " (Guerrero), 



In general appearance the plant is similar to some species of Vitis, but the 

 large fruits and inflorescences are unlike those of any native Mexican Vitis. 

 No information is available concerning the quality of the fruit ; but its large 

 size indicates that the plant might be a valuable one in cultivation. 



5. AMPELOPSIS Michx. Fl. Bor. Amer. 1: 159. 1803. 



Large vines with coiling tendrils; leaves simple or compound; flowers 

 polygamo-dioecious or polygarao-monoecious ; petals 5 ; fruit 2 to 4-seeded, not 

 edible. 



Ampelopsis arborea (L.) Rusby has been reported from Yucatan, but the 

 report is based upon specimens of Cissus trifoliata L. 



Leaves simple 1. A. cordata. 



Leaves trifoliolate 2. A. raexicana. 



1. Ampelopsis cordata Michx. Fl. Bor. Amer. 1: 159. 1803. 

 Veracruz. Southern and central United States. 



Glabrous throughout or nearly so; leaves broadly ovate, deltoid-ovate, or 

 cordate-ovate, 5 to 12 cm. long, acute or acuminate, coarsely serrate; cymes 

 small and loose ; fruit 2-seeded, bluish, 4 to 6 mm. in diameter. 



2. Ampelopsis mexicana Rose, Contr. U. S. Nat. Herb. 8: 51. 1905. 

 Sinaloa to Guerrero ; type from Acaponeta, Tepic. 



Stems glabrous, glaucescent; leaflets ovate to elliptic, 3 to 6 cm. long, 

 acuminate, coarsely serrate, pale beneath, pilosulous when young but soon 

 glabrate ; cymes long-pedunculate, loose and open ; seeds 2 or 3. 



This was described originally as having twice or thrice ternate leaves, an 

 error arising from the fact that a branch was mistaken for the rachis of a leaf. 



DOUBTFUL SPECIES. 



Ampelopsis ? denudata Planch, in DC. Monogr. Phan. 5: 619. 1887. Type 

 from Xochicalco, Mexico. 



