ROSACEA. 1Q5' 



Tkibe I. SPIPi/EACEiE. Carpels few, rarely solitary, becoming 2 - several-seeded follicles 

 (dehiscent jiods). Calyx open. 



3. Spiraea. Follicles 2 to 8. Seeds pendulous, linear ; the coat membranaceous : albumen 

 none. Shrubs or herbs, with simple or compound leaves, and compound inflorescence, 



1. Neillia. Follicles 1 to 5. Seeds erect and pendulous ; the coat crustaceous, shining : albu- 

 men present. Shrubs, with simple leaves : corymbs simple. 



Tp.ibe II. RUBE.E. Carpels several or numerous on a spongy receptacle, becoming drupe- 

 lets in fruit. Calyx open, without bractlets. Stamens numerous. Ovules 2 and pen- 

 dulous, but seed solitary. 



5. Rubus. Carpels indefinitely numerous, berry-like in fruit. Perennial herbs, or soft-woody 

 shrubs with biennial stems. 



TRIBE III. DliYADE.'E. Carpels numerous, several, or solitary, 1-ovuled, becoming dry 

 akenes. Calyx not enclosing or at least not constricted over the fruit. Seed erect or 

 ascending. 



» Shrubs : carpels mostly solitary : style not elongated in fruit : stigma decurrent : calyx imbri- 

 cated, without bractlets : radicle inferior (except in Coleogync). 



fi. Chamaebatia. Flowers corymbose. Petals 5. Leaves thrice pinnate, with minute leaflets. 



7. Purshia. Flowers solitary. Petals 5. Leaves S-cleft. 



8. Coleogyne. Flowers solitary. Calyx 4-parted, colored. Petals none. Leaves opposite, 



small, naiTow, entire. 



« « Trees or shrubs : carpels solitary or numerous : styles elongated and plumose in fruit : calyx 

 imbricated, without bractlets (except in Falhujia) : seed erect. 



0. Cercocarpus. Flowers solitary, axillary, small. Petals none. Carpels solitary, rarely 2. 

 I 'alvx-tube long-cylindrical ; the limb deciduous. Leaves simple, entire or toothed. 



10. Cowania. Flowers solitary, short-peduncled, terminal, showy. Petals 5. Carpels 5 to 12. 



Calyx short and turbinate. Leaves cuneate, lobed. 



1 1 . Pallugia. Flowers somewhat panicled, on long peduncles, showy. Petals 5. Carpels nu- 



merous. Calyx turbinate. Leaves with linear lobes. 



« * * Herbs: carpels few to many : calyx concave or campanulate, valvate in tin ' I. 



-i- Seed erect from the base of the cell : radicle inferior : style strictly terminal, persistent. 



1 2. Geum. Carpels very numerous on a dry receptacle : the elongated style in fruit mostly 



geniculate or plumose. 



+■ -f- Seed suspended or- ascending : radicle superior : style small, naked, not geniculate. 



18. Fragaria. Carpels very numerous, in fruit on a large fleshy scarlet receptacle. Styles 



lateral. Leaves 3-foliolate. 

 1 1. Fotentilla. Petals yellow, rarely white, sessile. Stamens usually 20 or more ; filaments 



narrow or filiform. Carpels mostly numerous, '>n a dry receptacle. Leaves pinnate or 



digitate; leaflets toothed or cleft, not confluent. 



15. Sibbaldia. Petals yellow, sessile, minute and narrow. Stamens 5 ; filaments very short, 



filiform, i 'a r pels 5 to 10, on a dry receptacle. Leaves 3-foliolate : leaflets 3-toothed. 



16. Horkelia. Petals white or pink, with claws, or spatnlate. Stamens 10, rarely 20; fila- 



ments usually dilated or subulate. ( larpels usually many, on a dry nearly naked recep- 

 tacle. Leaves pinnate ; leaflets many, toothed, cleft, oi parted, the upper confluent. 



17. Ivesia. Petals white or yellow, with claws, or spatulate. Stamens 5 to 20 ; filaments fili- 



form. Carpels 1 to 1"', on a dry villous receptacle. Leaves pinnate ; leaflets clefl or 

 parted, "Hen small and very numerous and closely imbricated. 



Tbidk IV. 1'nTF.KIK.E. Carpels 1 to :i, in fruit akenes, completely enclosed in the dry and 

 firm calyx-tube, the throat of which is constricted or sometimes nearly closed. Seed 

 suspended. 



• Heath-like shrubs, with simple entire I, r j, |,..] leaves : ovules l or 2. (Anomalous genus.) 



18. Adenostoma. Calyx 10-nerved, at length cylindracoous. Petals S. Stamens 8 to 15. 



• • Herbs (as to ours), with compound or lobed leaves : ovule solil 



19. Alchemilla. Calyx naked, urceolate, minutely bractoolatc. Petalsnone. Stamens 1 to I 



Flowers minute, clustered. 



20. Agrimonia. Calyx turbinate, surrounded bi i margin of hooked prickles. Petals yellow. 



Stamens 5 to 12, Tall perennial herbs, with pinnat 



