STANDLEY TREES AND SHRUBS OF MEXICO. 337 



3. HETEBOMELES M. Roemer, Fam. Nat. Syn. 3: 105. 1837. 

 1. Heteromeles salicifolia (Presl) Abrams, Bull. N. Y. Bot. Gard. 6: 381. 1910. 



Crataegus arbuti folia Ait. Hort. Kew. 3: 202. 1811. Not C. arhutifoUa 

 Lam. 1783. 



Photinia arbutifolia Lindl. Trans. Linn. Soc. Bot. 13: 103. 1821. 



Heteromeles arhutifoUa M. Roemer, Fam. Nat. Syn. 3: 105. 1847. 



Photinia salicifolia Presl, Epini. Bot. 204. 1849. 



Baja California, ranging from sea level up to 1,680 meters. California ; 

 type from Monterey. 



Shrub or tree, 2 to 9 meters higb, sometimes with a trunk 45 cm. in di- 

 ameter ; bark thick, light gray, shallowly fissured ; leaves persistent, oblong, 

 acute, 8 to 10 cm. long, dentate ; flowers small, white, in large panicles ; fruit 

 red or yellow, about 1 cm. long, astringent ; wood hard, close-grained, reddish 

 brown, its specitic gravity about 0.93. 



The tree is known in California as " tollon," " Christmas-berry," and " Cali- 

 fornia holly." It is often used for Christmas decorations. The fruit is edible. 



4. AMELANCHIER Medic. Phil. Bot. 1 : 155. 1789. 

 Shrubs or small trees ; leaves petiolate, persistent or deciduous, entire or 



denticulate ; flowers racemose, solitary, or clustered, white, rather showy ; fruit 



a small, juicy pome. 



Leaves small, 0.7 to 1.8 cm. wide, the lateral nerves not very conspicuous be- 

 neath ; calyx usually glabrous outside ; inflorescence commonly short and 

 umbelliform 1. A. denticulata. 



Leaves large, usually 2.3 cm. wide, the lateral nerves coarse and very conspicu- 

 ous beneath ; calyx densely white-tomentose outside ; inflorescence elongate, 

 racemose 2. A. nervosa. 



1. Amelanchier denticulata (H. B. K.) Koch, Dendrol. 1: 183. 1869. 

 Cotoneaster denticulata H. B. K. Nov. Gen. & Sp. 6 : 169. pi. 556. 1823. 

 Nagelia denticulata Lindl. Bot. Reg. 31 : Misc. 40. 1845. 

 Crataegus minor Sesse & Moc. PI. Nov. Hisp. 84. 1887. 



Chihuahua and Coahuila to Mexico and Oaxaca ; type from Actopan, Hidalgo. 



Erect shrub, 1 to 3.5 meters high, densely branched, the branches gray or 

 brown ; leaves 1 to 2.5 cm. long, entire or denticulate ; flowers about 1 cm. 

 broad ; fruit red, dark purple, or black, 8 to 10 mm. long. " Membrillito " (Vera- 

 cruz) ; " membrillo cimarron," " tlaxisqui,'' " tlaxistle " (Valley of Mexico); 

 '■ membrillo " (Oaxaca); " madronillo " (Coahuila). 



The fruit is edible. The stems, according to Herrera, are made into canes, 

 known as " varitas de Apizaco," which are notable for their flexibility. In the 

 typical form of the species the calyx is tomentose outside, but in most of the 

 specimens the calyx is glabrous. The northern (glabrous) form may be a dis- 

 tinct species, but there seem to be some intermediate specimens. Crataegiis 

 ineniiis Sesse & Moc^ is perhaps another synonym of this species. 



2. Amelanchier nervosa (Decaisne) Standi. 



Cotoneaster nervosa Decaisne, Nouv. Arch. Mus. Paris 10: 177. 1874. 

 Chiapas and Oaxaca. 



Leaves 3 to 4.5 cm. long, very thick, bright green on the upper surface, white 

 or gray-tomentose beneath, usually entire. 



' PI. Nov. Hisp. 84. 1887. 



