LOGANIA FAMILY 657 



Family 102. LOGANIACEAE. Logania Family. 



Herbs, shrubs, or vines. Leaves opposite or whorled, simple. Flowers 

 perfect, regular, in cymes or panicles. Calyx inferior, 4- or 5-lobed. Cor- 

 olla gamopetalous, 4- or 5-lobed; lobes imbricate or convolute. Stamens 4 

 or 5, alternate with the corolla-lobes. Anthers opening lengthwise. Ovary 

 superior, 2-celIed (rarely 3-5-celled); styles more or less united. Ovules 

 . solitary or two (rarely numerous) in each cavity, amphitropous or anatro- 

 pous. Fruit sometimes capsular, 2-valved, or a berry or drupe. 



1. BUDDLEIA L. 



Shrubs or trees, or undershrubs. Leaves opposite, with more or less developed 

 stipules. Flowers in dense heads, rarely in panicles. Calyx campunulate, 4- 

 lobed or 5-lobed. Corolla rotate-campanulate to salverform. Stamens 4, 

 rarely 5; filaments adnate to the corolla-tube. Ovar}^ 2-celled; styles united. 

 Capsule globular or oblong, septicidal, 2-valved. 



1. B. utahensis Coville. Shrub 2-3 dm. high; young branches, leaves, and 

 calyces densely tomentose; leaves linear-oblong, irregularly undulate, revolute- 

 margined, thick, venose-reticulate, 1.5-2 cm. long, obtuse; inflorescence of 2-9 

 verticels, about 1.5 cm. in diameter; calyx-lobes l-nerved; corolla purple or 

 browmish purple; tube tomentose without; lobes rounded, spreading; anthers 

 sessile in the throat of the corolla. Rocky places: Utah — Nev. Sou, 



Family 103. GENTIANACEAE. Gextian Family. 



Annual or perennial caulescent herbs, or in warmer chmates rarely shrubs. 

 Leaves normally opposite, sometimes connate at the base. Inflorescence 

 cymose. Flowers regular^ perfect. Calj^ of 2, 4, or 5, more or less united 

 sepals. Corolla of 4 or 5 more or less united petals; lobes convolute or 

 imbricate, entire or fringed. Stamens as manj' as the corolla-lobes and 

 alternate with them, partly adnate to the corolla. Gynoecium of two 

 united carpels; ovary 1-celled, superior, with 2 parietal placentae. Fruit 

 a capsule. 



CoroUa not spurred. 



Style filiform, mostly deciduoiis. 



CoroUa small, red. rose, or yellowish; tube surpassing the calyx: filaments spirally 



twisted. 1. CENTAURELltf. 



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

 recurved. 2. EusTOiL\. 



Style stout, short, persistent, or none. 



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

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



inserted in the corolla-tube. 



Corolla without plaits or lobes in the sinuses; calyx without an inter-calycine 



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. AXTHOPOGON-. 



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

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



4. Am-\rell.\. 

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

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

 its lobes valvate. 



Antliers cordate- versatile; dwarf annuals or biennials, with terminal 



sohtary flowers. 5. Condrophtlt^\. 



Anthers linear or oblong, extrorse; perennials, with mostly axillary 

 flowers. 6. Dasysteph.\na. 



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

 the corolla. 7. Pleurogtne. 



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



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



base. 8. Sw^ertl\. 



Style manifest; leaves opposite or verticil late. 



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



to the valves. 



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