STANDLEY TREES AND SHRUBS OF MEXICO. 1083 



6. Oreopanax echinops (Schlecht. <& Cham.) Planch. & Decaisne, Rev. Hort. 



1854: 108. 1854. 



Aralia ecMnops Schlecht., & Cham. Linnaea 5: 409 1830. 



Veracruz and Oaxaca ; type from Hacienda de la Laguna, Veracruz. 



Shrub or tree, densely and coarsely stellate-pubescent throughout ; leaflets 

 5 (some of the leaves occasionally only lobed), obovate or oblong-obovate, 9 

 to 26 cm. long, sessile, abruptly cuspidate-acuminate, thin, remotely sinuate- 

 dentate or subentire ; heads 1.5 to 2.5 cm. long, on stout peduncles, in long 

 simple racemes, very dense and many-flowered, the bractlets cuspidate- 

 acuminate. 



7. Oreopanax langlassei Standi., sp. nov. 



Type from the Sierra Madre of Michoacan or Guerrero, altitude 1,750 meters 

 {Langlass6 796; U. S. Nat. Herb. no. 386193). 



Slirub or small tree, 4 to 5 meters high ; leaves (only one seen) long- 

 petiolate, the leaflets 7, slender-petiolulate, narrowly lance-oblong, 10 to 14 

 cm. long, 2.5 to 3 cm. wide", long-acuminate, cuneate at base, entire, finely 

 pubescent above with sessile stellate hairs, coarsely pubescent beneath with 

 stipitate stellate hairs; racemes very long (40 cm. or more) and slender, 

 densely stellate-pubescent, the peduncles slender, about 2.5 cm. long ; staminate 

 heads 5 to 6 mm. in diameter, dense, many-flowered. 



8. Oreopanax xalapense (H. B. K.) Decaisne & Planch. Rev. Hort. 1854: 



108. 1854. 



Aralia xalapensis H. B. K. Nov. Gen. & Sp. 5: 8. 1821. 



Monopanax ghiesbreghtii Regel, Gartenflora 18: 35. pi. 606. 1869. 



Oreopanax thibautii Hook. f. in Curtis's Bot. Mag. 104: pi. 63^0. 1878. 



Oreopanax tauiertiannm Donn. Smith, Bot. Gaz. 19: 4. 1894. 



Oreopanax loesenerianum Harms, Bot. Jahrb. Engler 23: 127. 1896. 



Jalisco to Veracruz and Chiapas; type from Jalapa, Veracruz. Central 

 America. 



Shrub or small tree, sometimes epiphytic ; leaflets 5 to 9, narrowly oblong to 

 obovate, 8 to 30 cm. long, acute to long-acuminate, entire or serrate toward the 

 apex, when young usually minutely stellate-pubescent beneath but soon gla- 

 brate ; heads 5 to 15 mm. in diameter, in long racemes ; fruit black. " Higuera " 

 (Costa Rica); " brasil" (El Salvador). 



The rather ample material available exhibits notable diversity in size and 

 shape of leaflets and size of heads, and it may be that more than a single 

 species is represented. Much more material is necessary, however, before this 

 can be determined, and it seems probable to the writer that all the specimens 

 represent a single variable species. O. taubertinnum is a form with serrate 

 leaflets, 0. loesenerianum is noteworthy for the small staminate heads, which 

 are only 5 mm. in diameter. 



3. GILIBERTIA Ruiz & Pav. Fl. Peruv. Chil. Prodr. 50. 1794. 



Glabrous shrubs or trees; leaves simple, entire or 3-lobate, long-petiolate ; 

 umbels paniculate or umbellate, the bracts minute or none ; flowers perfect ; 

 calyx entire or 5 or 6-denticulate ; petals 5 or 6 ; fruit fleshy, 5 or 6-celled. 



Lateral nerves of the leaves ascending at an acute angle 1. G. arborea. 



Lateral nerves divaricate horizontally 2. G. juergenseni. 



1. Gilibertia arborea (L.) Marchal, Bull. Soc. Bot. Belg. 30: 281. 1891. 

 Aralia arborea L. Syst. Nat. ed. 10. 967. 1759. 

 Hedera alar is Schlecht. Linnaea 9: 605. 1884. 



