IV Flora of the Palouse Region 



Flowers in the axils of dry chaffy scales (glumes), arranged in spikes or 

 spikelets. 

 Fruit a grain: stems mostly hollow. gramineae 14 



Fruit an akene: stem solid. cvperaceae • 33 



Carpels united into a compound ovary: parts of the usually complete flowers 

 mostly in threes or sixes. 

 Flowers regular: seeds with endosperm, not numerous or minute: ovary 

 superior or inferior. 

 Ovary superior. 



Perianth-segments distinct, green or brown, not petal-like: 

 herbs with grass-like leaves and small flowers. 



juncaceae 38 



Perianth-segments distinct or partly united, at least the inner 



petal-like. ijliaceae 40 



Ovary inferior, wholly or in part. iridaceae 47 



Flowers irregular: seeds without endosperm, very numerous and minute: 



ovary inferior. orchidaceae 48 



Subclass ii. DICOTYLEDONES. 



I— PETALS DISTINCT TO THE BASE OR WANTING. 



A— PETALS NONE. 



1— FLOWERS, AT LEAST THE STAMINATE, IN AMKXTS. 



Fruit a i-seeded nutlet: flowers monoecious. betulaceae 54 



Fruit a many-seeded capsule: flowers dioecious. salicaceae 51 



2 -FLOWERS NOT IN AMENTS. 



a — Ovules many in each cell of the ovary. 



Ovary 1, inferior. ' ARISTOLOCHIACEAE 59 



Ovary 1, superior. 



Ovary 3-5-celled. ficoideae 67 



Ovary 1 or 2-celled. 

 Placenta central. 



Stamens on the throat or tube of the calyx. 



LYTHRACEAE 120 



Stamens on the receptacle or base of the calyx. 



CARYOPHYLLACEAE 69 



Stamens more than 2 



Stamens 2. Synthyris in scrophulariaceae 162 



Placenta 1, parietal / ,..,., „.. T . „„. ^ 



„ . ' ^ , - RANUNCULACEAE 74 



Ovaries 2 or more, separate, simple. \ '^ 



b— Ovules i or .?, rarely 3 or 4, in each cell of the ovary. 

 Pistils more than 1, distinct or nearly so. 



Stamens perigynous. rosaceae 93 



Stamens hypogynous. ranunculaceae 74 



Pistil 1, simple or compound. 

 Ovary wholly inferior. 



Parasitic on branches of trees: anthers sessile. 



LORANTHACEAE 58 



Not parasitic above ground: anthers on filaments. 



SANTALACEAE 58 



Ovary superior, enclosed by the calyx-tube. 



Poteriutn in rosacea 1-; 93 



Ovary superior, not enclosed by the calyx-tube. 



