OLIVE FAMILY 179 



Family 101. OLEACEAE. Olive Family. 



Fruit indehiscent; plant dioecious or polygamous; corolla in ours wanting; calyx-lobes 4. 



Fruit a samara. 1. Fhaxinus. 



Fruit a drupe. 2. Forestieha. 



Fruit a dehiscent, didymous capsule; flowers perlect; corolla present, roate, 5-lobed: 



calyx 5-15 lobed. 3. Menodora. 



1. FRAXINUS (Tourn.) L. Ash. 



Flowers polygamous; leaves simple or rarely 3-foliolate. 1. F. anomala. 

 Flowers dioecious; leaves pinnately 5-9-foljolate. 



Leaflets sessile, rather thin. 2. F. campestris. 



Leaflets petiolulate, thick, subcorlaceous. 3. F. coriacea. 



2. FORESTIERA Poir. l. F. neomexicana. 



3. MENODORA H.B.K. l. M. scabra. 



Family 102. LOGANIACEAE. Logania Family. 

 1. BT7DDLEIA L. l. B. utahensis 



Family 103. GENTIANACEAE. Gentian Family. 



Corolla not spurred. 



Style filiform, mostly deciduous. 



Corolla small, red, rose, or yellowish; tube surpassing the calyx; filaments spirally 



twisted. 1. Oentaukeum. 



Corolla large, blue, purple, or white; tube much shorter than the calyx; stamens 

 recurved. 2. Eustoma. 



Style stout, short, persistent, or none. 



Corolla without nectariferous pits, glands (except in species of Amarella) , or scales. 

 Corolla campanulate, fuouelf orm, or salver-shaped ; calyx 4- or 5-lobed ; stamens 

 inserted in the corollsi-tube. 

 CoroUa without plaits or lobes in the siniises; calyx without an inter-calycme 

 membrane; sepals imbricate. 

 Flowers 4-merous, rather large, usually more than 3 cm. long; corolla- 

 lobes more or less fringed or toothed; inner sepals broader, mem- 

 branous-margined. 3. Anthopogon. 

 Flowers 5-merous (rarely 4-merous), small, less than 2 cm. long; outer 

 sepals broader; corolla-lobes never fringed, rarely toothed. 



4. Amarella. 

 Corolla plicate in the sinuses, the plaits more or less extended in mem- 

 branous lobes or teeth; calyx with an inter-calycine mfembrane; 

 its lobes valvate. 

 Anthers cordate- versatile; dwarf annuals or biermials, with terminal 



solitary flowers. 5. Conbrophylla. 



Anthers linear or oblong, extrorse; perennials, with mostly a.xiUary 

 flowers. 6. Dasystephana. 



Corolla rotate; calyx parted to near the base; stamens inserted on the base of 

 the corolla. 7. Pledrogyne. 



Corolla rotate, with nectariferous pits, glands, or scales. 



Style none; leaves opposite, rarely alternate; corolla without a crown at the 



base. 8. Swertla. 



Style manifest; leaves opposite or verticillate. 



Each division of the corolla with a single gland; capsule flattened paraUell> 

 to the valves. 

 Corolla without a crown; leaves not white-margined. 



9. Frasbra. 

 Corolla with a decurrent crown contiguous with the gland; leaves 

 white-margined. 10. Leucocraspeddm. 



Each division of the corolla with a pair of oblong glands and a separate 

 crown below; capsule flattened contrary to the valves. 



11. TESSAHANTHIXm. 



Corolla spurred. 12. Tetragonanthus. 



1. CENTAUREUM Hill. Centaury. 



Corolla-lobes 4—6 mm. long, about half as long as the tube; aimuals. 



Corolla-lobes oblong, obtuse. ■ 1. C. exallatum. 



Corolla^lobes ovate or lanceolate, acute. 2. C. Nuitallii. 



Corolla-lobes 7-10 mm. long, about three-fourths as long as the tube; perennials. 



3. C. arizonicum. 



2. EUSTOMA Salisb. l. E. BusselUanum. 



3. ANTHOPOGON Necker. Fringed Gentian. 



Annuals or biennials; flowers on naked long peduncles terminating the branches, not 

 bracteate. 



