TILIACEAE 759 



3. Partheaocissus laciniata (Planch.) Small. A straggling vine, with long tendrils 

 destitute of disks, the stems with a smooth or slightl}' rougliened bark. Leaflets 5 B, the 

 blades thin, 4-10 cm. long, coarsely toothed with more or less flaring teeth, manifestly 

 petioluled : corymbs 5 cm. broad, 'many-flowered, drooping in fruit : berries 5-7 mm. in 

 diameter. [Parthenocissus quinquefolia var. laciniaki Planch. ] 



On river banks and in woods, Iowa to Michigan, Ohio and Colorado. Spring ; fruit ripening in 

 the fall. 



4. Parthenoclssus heptaphylla (Buckl.) Britton. A glabrous vine, sometimes 

 climbing to the height of 10 m., with long forking tendrils. Leaflets mostly 7, the blades 

 oblanceolate or oblong-oblanceolate (or the lateral ones oblong-lanceolate), acuminate, 

 coarsely toothed above the middle or incised, often cuneately narrowed at the base, sessile 

 or short-petioluled : corymbs 4-8 cm. broad, pendulous : berries subglobose, about 5 mm. in 

 diameter, dark blue or "nearly black: seeds 3-4, nearly 4 mm. long. [Ampelopsis hepta- 

 phylla Buckl.] 



In rocky or sandy soil, chiefly in or near the mountains, Texas. Spring. 



Order 19. MAL VALES. 



Herbs, shrubs or trees. Leaves various : blades simple, commonly lobed. 

 Flowers often showy, commonly involucrate. Calyx of distinct or partially 

 united valvate sepals. Corolla of distinct petals. Androecium of numerous 

 stamens with monadelphous filaments or these collected into several sets, or few 

 in BuETTNERiACEAE. Gynoecium of several united or distinct carpels. Ovaries 

 with axile placentae. Mature carpels sometimes separating from each other. 



Stamens numerous (in our genera). 



Stamens distinct or in several groups : anthers 2-celled. Fam. 1. Tiliaceae. 



Stamens monadelphous : anthers 1-celled. Fam. 2. Malvaceae. 



Stamens as many as the sepals. Fam. 3. Buettneriaceae. 



Family 1. TILIACEAE Juss. Linden Family. 



Shrubs or stately trees, or rarely herbs, pubescent with simple or branched 

 hairs. Leaves alternate or rarely opposite : blades simple : stipules free, often 

 deciduous. Inflorescence sometimes opposite the leaves, often racemose, cymose 

 or corymbose. Flowers usually perfect, regular. Calyx of 4-5 valvate decidu- 

 ous sepals. Corolla of 4-5 hypogynous imbricated or convolute often clawed 

 petals which sometimes develop a more or less petaloid scale at the base. 

 Androecium of usually numerous stamens or sometimes twice as many as the 

 sepals. Filaments distinct, sometimes collected in groups opposite the petals, 

 simple or forked. Anthers 2-celled, erect or versatile. Pollen smooth. Gynoe- 

 cium a compound pistil. Ovary free, sessile or stalked, 2-10-celled, each cavity 

 with an incomplete secondary partition. Styles united. Stigma capitate, di- 

 lated or several-lobed. Ovules 2-many, in two rows in each cavity, anatro- 

 pous. Fruit a loculicidal, a rarely septicidal capsule, or sometimes nut-like or 

 berry -like. Seeds numerous or sometimes solitary, Avith a crustaceous or mem- 

 branous testa. Endosperm fleshy or rarely wanting. Cotyledons sometimes 

 lobed. 



Peduncles or pedicels without a conspicuous bract : filaments not forked : fruit capsular. 



Petals inserted with the stamens : capsule often silique-like. 1. Corchorus. 



Petals inserted below the stamens, at the base of an elevated receptacle : capsule 



subglobose. 2. Triumfetta. 



Peduncles each with a conspicuous adnate bract : filaments forked : fruit nut-like. 3. Tilia. 



1. CORCHORUS L. 



Herbs or small shrubs. Leaves alternate : blades serrate. Flowers solitary or several, 

 usually on short peduncles opposite the leaves. Sepals 5 or rarely 4. Petals yellow, 5 or 

 rarely 4, naked at the base, convolute. Stamens numerous, or twice as many as the sepals, 

 inserted with the petals : filaments filiform, not forked : anthers introrse. Ovary 2-5- 

 celled, superior: stigma dilated, undulate. Ovules numerous in each cavity. Capsule 



