ROSACE AE. 177 



Family 45. ROSACEAE. Rose Family. 



Herbs, shrubs or trees with alternate mostly stipulate 

 leaves and regular flowers. Calyx free from or adnate 

 to the ovary, usually 5-lobed, sometimes bracteolate. 

 Petals distinct, equal in number to the calyx-lobes or 

 none. Stamens usually numerous, inserted on the calyx; 

 anthers 2-celled, longitudinally dehiscent or rarely by 

 pores. Carpels 1-many, distinct or united. Ovary 1- 

 several-celled. Seeds 1 or few in each cell, anatropous; 

 endosperm present or wanting. 



Herbs. 



Petals present. 



Styles terminal; ovules pendulous. 



Petals yellow. 3. Potentilla. 



Petals white. 6. Horkelia. 



Styles lateral; ovules ascending. 4. Argentina. 



Styles nearly basal. 5. Drymocallis. 



Petals none; pistil 1. 9. Alchemilla. 



Shrubs. 



Stems unarmed. 



Fruit an achene or follicle. 



Flowers solitary or somewhat fasci- 

 cled. 7. Cercocarpus. 

 Flowers in terminal racemes. 



Leaves alternate, toothed or 



lobed. 1. Sericotheca. 



Leaves fascicled, entire, minute. 8. Adenostoma. 

 Fruit a cluster of drupelets, berry-like. 2. Rubus. 

 Stems prickly. 



Calyx not fleshy; fruit a cluster of drupe- 

 lets. 2. Rubus. 

 Calyx fleshy; enclosing the achenes. 10. Rosa. 



1. SERICOTHECA Raf. 



Unarmed shrubs with simple toothed or lobed exstipu- 

 late deciduous leaves and terminal panicles of numerous 

 white flowers. Calyx deeply 5-cleft, nearly rotate. 

 Petals 5, rounded. Stamens 20, inserted on an annular 

 perigynous disk. Pistils 5, distinct, becoming 1-seeded 

 hairy carpels, tardily dehiscent by the dorsal suture or 

 indehiscent (Holodiscus Maxim.). 



Inflorescence well compound, ample; leaves 3-6 



cm. long. L S. franciscana. 



Inflorescence small and narrow, a simple raceme 



or with a few short branches. 2. S. concolor. 



