196 



Etosaceae 



Herbs. 



Petals present. 



Styles terminal; ovules pendulous. 

 P< t uls yellow. 

 Petals white. 

 Styles lateral: ovules ascending. 

 Styles nearly basal. 

 Petals none: pistil 1. 

 Shrubs. 



Stems unarmed. 

 Fruit a pome. 

 Fruit an achene or follicle. 



Flowers solitary or somewhat fascicled. 

 Flowers in terminal racemes. 



Leaves alternate, toothed or lobed. 

 Leaves fascicled, entire, minute. 

 Fruit a cluster of drupelets, berry-like. 

 Fruit a drupe. 

 Stems prickly. 



Calyx not fleshy: fruit a cluster of drupelets. 

 Calyx fleshy; enclosing the achenes. 



1. HOLODISCUS Maxim. 



■4. POTKNTII.I.A. 



7. HORKKI.IA. 



5. ARGENTINA. 



6. DRYMOCAI.I.ls 

 1U. ALCHEMILI.A. 



■2. Heteromeles. 



8. Cercocarpus. 



1. holodiscus. 



9. Adenostoma. 



3. RtJBUS. 



12. Proncb. 



3. RUBUS. 



11. Rosa. 



Unarmed shrubs with simple toothed »>r 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. 



1. H. discolor (Pursh) Maxim. Shrub, 1-2 m. high; the 

 branches short, rigid ; bark grayish brown, more or less shreddy : 

 leaves ovate, cuneately narrowed to a short winged petiole, pin- 

 nately lobed or toothed above the middle, green and nearly gla- 

 brous above, whitish tomentose beneath ; panicles erect, branch- 

 ing; carpels hirsute. {Spirea discolor Pursh.) 



Occasional in the San Gabriel Mountains in the chaparral belt. 



i'. H. discolor dumosus (Nutt.) Wats. Lower and more 

 compact : panicle smaller, unbranched. 

 Mount San Antonio near the summit. 



2. HETEROMELES Roem. CHRISTMAS BbbBT. 



A small evergreen tree or sometimes shrubby, with 

 simple coriaceous toothed Leaves and terminal corymbose 



