STANDLEY TEEES AND SHRUBS OF MEXICO. 1159 



1 Prestonia contorta (Mart. & Gal.) Hemsl. Biol. Centr. Amer, Bot. 2: 311. 



1881. 

 • Hacmadictyon contortum Mart. & Gal. Bull. Acad. Brux. 11: 360. 1844. 



Type from Zacatepec, Oaxaca. 



Leaves petiolate, oval, acuminate, subcordate at base, pubescent above, velu- 

 tinous beneath; cymes dense, bifid, longer than the leaves; corolla about 2.5 

 cm. long, red, the lobes ovate-rounded. 



2. Prestonia langlassei Standi., sp. nov. 



Sinaloa to Guerrero ; type from La Correa, Michoacan or Guerrero, altitude 

 50 meters {Langlass6 435; U. S. Nat. Herb. no. 385945). 



Stems slender, obscurely puberulent or glabrate; petioles slender, 10 to 16 

 mm. long ; leaf blades oblong-ovate, 5.5 to 10 cm. long, 2.2 to 5 cm. wide, trun- 

 cate or subcordate at base, acuminate or cuspidate-acuminate at apex, thin, 

 obscurely puberulent, the lateral nerves 6 or 7 on each side ; cymes many- 

 flowered, nearly as long as the leaves, pedunculate; pedicels puberulent, 10 to 

 17 mm. long; cal.vx lobes linear, about 5 mm. long; corolla blackish i-ed, the 

 tube 18 to 20 mm. long, sparsely villosulous, the lobes about 1 cm. long ; anthers 

 conspicuously exserted. 



3. Prestonia schizadenia (Muell. Arg.) Hemsl. Biol. Centr. Amer. Bot. 2: 312. 



1881. 



Hacmadictyon schisadcnium Muell. Arg. Linnaea 30: 431. 1860. 



Tj-pe from Papantla, Veracruz. 



Branches scabrid ; leaves short-petiolate, oblong-ovate or oblong-elliptic, 12 

 to 15 cm. long, 4.5 cm. wide, short-acuminate, rounded or cordate at base ; 

 cymes half as long as the leaves; calyx 14 mm. long, glabrous; corolla 2.5 

 cm. long, glabrous. 



4. Prestonia mexicana (A. DC.) Hemsl. Biol. Centr. Amer. Bot. 2: 312. 1881. 

 Haemadictyon mexicanum A. DC. in DC. Prodr. 8: 428. 1844. 



Guerrero to San Luis PotosI, Veracruz, and Morelos. Central America. 



Large scandent shrub ; leaves very short-petiolate, 8 to 16 cm. long, 5 to 

 12 cm. wide, rounded or obtuse at apex and shortly cuspidate, rounded or 

 subcordate at base, densely covered with fulvous pubescence ; calyx 1.5 to 2.5 

 cm. long, tlie lobes ovate or lance-oblong; corolla about 4 cm. long, densely 

 pilose ; follicles divaricate, about 8 cm. long and nearly 2 cm. thick, densely 

 hispid ; seeds with a coma of long soft hairs. " Cacha de chivo " (El Salvador). 



5. Prestonia sericea Mart. & Gal. Bull. Acad. Brux. 11: 360. 1844. 

 Type collected in Oaxaca. 



Stems villous ; leaves subsessile, acuminate, subcordate at base, villous above, 

 sericeous-tomentose beneath ; calyx lobes cordate-ovate, acuminate ; corolla 

 sericeous-villous. 



Probably only a form of P. mexicana. 



14. MACROSIPHONIA Muell. Arg. in Mart. Fl. Bras. G^: 137. 1860. 



Plants erect, low, f ruticose or suffrutescent ; leaves mostly opposite, sessile 

 or short-petiolate ; flowers large and showy, terminal or becoming lateral, 

 short-pedicellate ; calyx 5-parted, glandular within, the lobes narrow ; corolla 

 funnelform, the tube slender, elongate, enlarged above; anthers oblong or 

 sagittate, appendaged at base; follicles long and slender, erect. 



Leaves orbicular or reniform-orbicular, as broad as long 1. M. hesperia. 



Leaves linear to oval, longer than broad. 



Leaves green beneath, thinly puberulent 2. M. brachysiphon. 



Leaves white-tomentose beneath. 



