450 MALACEAE 



acuminate at the apex, cimeate at the base, with 2-4 shallow lobes towards tne 

 apex, serrate, with gland-tipped teeth, slightly pubescent above and at the 

 junctions of the veins beneath; corymb pilose; sepals pubescent within, ovate, 

 acuminate, sometimes with stalked glands; stamens 10; styles 3 or 4; fruit glo- 

 bose, 8-10 mm. thick, red, shghtly pubescent. Banks: nw Mont. Suhmont 

 My-Jl. 



8, C. Columbiana Howell. A shrub or small tree, much branched; leaves 

 rather thin, obovate or ovate, 2-6 cm. long, cuneate at the base, with 3 or 4 

 pairs of sharp lobes, sharply and doubly toothed, sparingly long-hairy, especially 

 along the veins; corymb sparingly long-hairy; sepals triangular, long-pointed, 

 slightly long-hairy within, glandular-toothed; stamens about 10; fruit pear- 

 shaped or ellipsoid, 8-12 mm. long, scarlet. C. Fiperi Britton, a form with 

 hairy corj-mb and fruit. River banks: B.C. — N.D. — Ida. — Ore. Suhmont. 



Family 62. AMYGDALACEAE. Plum Family. 



Trees of shrubs, with alternate simple leaves and deciduous stipules. 

 Flowers perfect, in ours regular. Hypanthium w^ell developed, mostly cup- 

 shaped, with an angular disk at the mouth bearing the stamens. Sepals 

 and petals 5. Stamens in ours 10 or more. Pistils usually solitary. Fruit 

 a drupe. 



L 



Drupe witli pulpy exocarp; leaves not fascicled. 1. Prunus. 



Drupe with almost dry exocarp, pubescent; leaves fascicled. 2. EmplectocladuS. 



!• PRUNUS L. Plums, Cherries. 



Shrubs or trees. Leaves alternate, deciduous, usually toothed. Flowers 

 perfect, either solitary, umbellate or cor>Tnbose from scaly buds, or corymbose 

 or racemose at the euds of leafy branches. Hypanthium" in ours campanulate 

 or turbmate. Sepals 5, imbricate. Petals 5, imbricate, inserted with the sta- 

 mens on a disc m the throat of the hypanthium. Stamens 15-30; filaments 

 filiform, distinct. Drupe, with a fleshy exocarp, often with a bloom; stone 

 bony, smooth. 



Flowers few, umbellate or corymbose. 



Fruit with a ventral groove and flat stone. (Plttms ) 



Leaves oval or orbicular, rounded at the apex. 1 P, subcordata. 



Leaves lanceolate to obovate, acute or acuminate. 



irees or shrubs, usually spiny: leaves serrate to near the base. 

 T . ^ 2. P. americnna. 



j?^ •+ ^?^ undershrub, unarmed; leaves entire at the base. 3. P. prunella. 



truit without a ventral groove; stone subglobose. (Cherries.) 



Creeping shrub; flowers umbellate. 4. R Besseyu 



Erect shrubs or trees. 



Hypanthium decidedly obconic; flowers umbellate from naked lateral buds. 

 XT ... , 5. P. ignota. 



Hj-panthium campanulate or turbinate; flowers more or less corjmibose. 

 Leaves acute, serrate. 



Corymbs naked. 6 p. pennsylmnica. 



Corymb usually subtended by 1 or 2 leaves. 7. P. corymbulosa. 

 Leaves obtuse or rounded at the apex, crenulate. 



Leaves glabrous. g p. emarginata, 



-r,, Leaves pubescent. a p nrunifolia. 



Flowers many, racemose on leafy branches. (Choke Cherhies x ''• •^' ^ 

 Leaves more or less pubescent beneath- vhi.kkiii.s.; 



i'edimcles stout; pedicels pubescent, shorter tv.nn f>.o f.-iiu /io,-;ri..r».c- i#>avfw thick. 



Pedimcles slen 



rather thin. 



Leaves glabrous oi 



10. P. valida. 



it. persistent: leav 



11. P. dernissa. 



12. P. melanocarpa 



1. P. subcordata Benth. Tree up to 8 m. high, with stout spreading 

 branches, finely pubescent, becoming glabrous; leaves oval to orbicular, 2.5-7 

 cm. long, finely double-toothed, pale beneath; sepals entire, rounded; fruit 2-3 

 cm. long, dark red or yellow. Rocky hiUs: Ore,— Ida.— Calif. Suhmont. 

 Mr-My. 



