1090 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



1. Chimaphila umbellata (L.) Barton, Veg. Nat. Med. 1: 17. 1817. 

 Pyrola umbellata L. Sp. PL 396. 1753. 



Chimaphila umbellata mexicana DC. Prodr. 7: 775. 1839. 



Chimaphila mexicana Rydb. N. Amer. Fl. 29: 31. 1914. 



In mountain forests, Veracruz, Mexico, Oaxaca, and Chiapas. Widely dis- 

 tributed in the United States, Canada, and Europe. 



Plants 10 to 40 cm. high, the stems simple or branched; leaves in whorls 

 of 4 to 7, 3 to 10 cm. long, acute or obtuse, sharply serrate, short-petiolate, 

 glabrous ; flowers long-pedicellate ; sepals broadly ovate ; petals pink, 7 mm. 

 long, oval ; capsule 6 to 10 mm. in diameter. 



The Mexican form is C. umbellata mexicana DC, but it differs only slightly 

 from the European plant, and scarcely seems worthy of special designation. 



2. Chimaphila maculata (L.) Pursh, Fl. Amer. Sept. 300. 1814. 

 Pyrola maculata L. Sp. PI. 390. 1753. 



Chimaphila maculata acuminata Lange, Nat. For. Kjobenhavn Vid. Medd. 

 1867: 112. 1868. 



Chimaphila acuminata Rydb. N. Amer. Fl. 29: 31. 1914. 



Chimaphila guatemalensis Rydb. N. Amer. Fl. 29: 32. 1914. 



Chimaphila dasystemma Torr. ; Rydb. N. Amer. Fl. 29: 32. 1914. 



In mountain forests, Chihuahua and Sonora to Veracruz and Oaxaca. Cen- 

 tral America; eastern United States. 



Stems 10 to 20 cm. high ; leaves in few whorls, oblong-lanceolate to broadly 

 ovate, 2 to 7 cm. long, acute or acuminate, glabrous ; inflorescence 1 to 4-fl:ow- 

 ered, the flowers long-pedicellate; sepals rounded-ovate, ciliolate; petals oval 

 or orbicular, 6 to 8 mm. long, white or pink ; capsule 6 to 8 mm. in diameter. 



The Mexican material varies appreciably in leaf shape, but the forms do not 

 appear to differ constantly from typical C. maculata. 



129. ERICACEAE. Heath Family, 



Reference: Small, N. Amer. Fl. 29:33-102. 1914. 



Shrubs or trees ; leaves alternate or rarely opposite, estipulate, persistent, 

 leathery, entire or serrate ; flowers perfect, usually in racemes or panicles ; 

 calyx of 4 to 7 distinct or partially united sepals ; corolla of 4 to 7 distinct or 

 united petals ; stamens as many or twice as many as the corolla lobes, the an- 

 thers 2-celled, often appendaged ; style compound, the stigma minute, discoid ; 

 fruit a capsule, drupe, or berry. 



Corolla of distinct petals. Fruit a capsule 1. BEFARIA. 



Corolla of united petals. 

 Fruit a capsule, the calyx dry, not accrescent. 

 Calyx lobes imbricate in bud ; pubescence not lepidote — 2. LEUCOTHOE. 

 Calyx lobes valvate or separated in bud ; pubescence of scales. 



3. XOLISMA. 

 Fruit baccate or drupaceous, or capsular but surrounded by the fleshy ac- 

 crescent calyx. 

 Fruit capsular, surrounded by the fleshy accrescent calyx. 



4. GAULTHEBIA. 

 Fruit baccate or drupaceous. 

 Fruit drupaceous ; cells of the ovary 1-ovulate. 



5. ARCTOSTAPHYLOS. 

 Fruit baccate ; cells of the ovary few or many-ovulate. 



Fruit papillose; large shrubs or trees 6. ARBUTUS. 



Fruit smooth; low shrubs 7. PERNETTIA. 



