660 MISC. PUBLICATION 42 3, U. S. DEPT. OF AGRICULTURE 



1. Plants autophytic and green, the leaves with well-developed blades, except 

 sometimes in Pyrola aphylla (3). 

 3. Petals separate; plants small, herbaceous or barely suffrutescent; anthers 

 not awned, opening by pores and often tubular-beaked at the apparent 

 apex (4). 

 4. Filaments greatly dilated above the base; flowers in corymbs (rarely 

 solitary); well-developed leaves borne along the stem. 



3. Chimaphila. 

 4. Filaments not dilated above the base, glabrous; flowers in racemes, or 

 solitary; well-developed leaves all basal or nearly so (5). 

 5. Flowers several; petals converging at anthesis; style often declined; 

 stigma lobes very short; valves of the capsule sparsely arachnoid- 

 pubescent on the edges when opening 4. Pyrola. 



5. Flower solitary; petals spreading at anthesis; style straight; stigma lobes 

 elongate, triangular, narrow;* valves of the capsule not pubescent 



on the edges 5. Moneses. 



3. Petals united, the corolla cylindric-urceolate; plants shrubby or arborescent, 



usually tall; anthers with 2 dorsal awns, opening by apical pores or 



slits (6). 



6. Ovary wholly inferior; plants small shrubs; leaves thin, deciduous; fruit 



a more or less juicy berry, crowned by the persistent calyx. 



8. Vaccinium. 

 6. Ovary wholly superior; plants mostly large shrubs or arborescent; leaves 

 thick, evergreen; fruit not juicy (7). 

 7. Fruit berrylike, only slightly fleshy, the surface granular-tessellate, 



glabrous 6. Arbutus. 



7. Fruit drupelike, dry, the surface not granular, glabrous or glandular- 

 pilose 7. Arctostaphylos. 



1. MONOTROPA. Pinesap 



Plant saprophytic, yellowish brown or red; stems beset with scale- 

 like leaves; flowers soon nodding; calyx of 3 to 5 separate bractlike 

 sepals; anthers more or less reniform; style erect, stout; fruit a 

 dehiscent 4- or 5-celled capsule. 



1. Monotropa hypopitys L., Sp. PI. 387. 1753. 



Coconino County to Cochise and Pima Counties, 7,000 to 8,500 feet, 

 rich soil in shade of pines, firs, and aspens, July and August. Widely 

 distributed in the Northern Hemisphere. 



The only form known to occur in Arizona is var. latisquama (Rydb.) 

 Kearney and Peebles (Hypopitys latisquama Rydb.), which differs from 

 the form of the eastern United States (var. americana DC, Hypopitys 

 americana Small) in the pink or red color of the plant, taller and 

 stouter stems up to about 30 cm. long, broader bracts, and more 

 numerous and larger flowers, with petals 10 mm. long or longer. 

 The plant is somewhat fragrant in drying. 



2. PTEROSPORA. Pinedrops 



Plant with a superficial resemblance to Monotropa but with a more 

 elongate inflorescence, smaller, more numerous, pendulous flowers, 

 and a 5-parted calyx. 



1. Pterospora andromedea Nutt., Gen. PL 1: 269. 1818. 



Coconino County to Cochise and Pima Counties, 6,000 to 9,500 

 feet, coniferous forests, July and August. Canada to Pennsylvania, 

 Arizona, California, and northern Mexico. 



3. CHIMAPHILA. Pipsissewa 



Plants herbaceous or nearly so; stems somewhat leafy; leaves 

 evergreen, thick and leathery, tending to form whorls; inflorescences 



