760 TILIACEAE 



usually elongated and silique-like, smooth or echinate. Seeds numerous, pendulous or 

 horizontal. Embryo folded, in the axis of the endosperm, witli entire cotyledons. 



Capsules with 4 tooth-like beaks. 1. C. siliquosus. 



Capsules with a single beak 2. C. pilolobus. 



1. Corchorus siliquosus L. Plant glabrous. Stems 3-10 dm. tall, often widely 

 branched : leaf-blades oval-ovate to oblong-lanceolate, 1-5 cm. long (those of the ultimate 

 branches smaller and rounder), acute or slightly acuminate, serrate, slender-petioled : 

 clusters often 2-flowered, short-peduncled : pedicels as long as the peduncles or longer: 

 sepals linear or oblong-linear, 5-6 mm. long: petals obovate, 4.5-5 mm. long: capsules 

 5-8 cm. long, ascending or spreading, truncate at the apex and each with 4 tooth-like beaks. 



In waste places, peninsular Florida and the Keys. Naturalized from the West Indies. 



2. Corchorus pilolobus Link. Plant minutely pubescent or glabrate. Stems 2-8 

 dm. tall, usually sparingly branched, hairy in lines : leaf-blades oblong to lanceolate, 2-5 

 cm. long, acute or slightly acuminate, serrate, short-petioled : clusters 2-3-flowered or 

 flowers sometimes solitary: pedicels 1-5 mm. long : sepals longer than the pedicels, acumi- 

 nate : petals spatulate, about as long as the sepals : stamens commonly 10 : capsules 4-5 

 cm. long, ascending or spreading, flattened contrary to the septa, each short-beaked with 

 a single process. ^ 



In waste places, Florida to Texas, Arizona and Mexico. 



2. TRIUMFETTA L. 



Herbs or shrubs. Leaves alternate : blades entire, toothed or 3-5-lobed. Flowers 

 perfect, in more or less clustered cymules, axillary or opposite the leaves. Sepals 5, nar- 

 row, often mucronate. Petals yellow, 5, convolute, with a pit at the base, or rarely want- 

 ing. Stamens numerous or rarely twice as many as the sepals, inserted on an elongated 

 receptacle above 5 glands : filaments filiform, unequal, not forked : anthers introrse. 

 Ovary 2-5-celled, in the cup-shaped top of the receptacle : stigma 2-5-lobed. Ovules 2 in 

 each cavity. Capsule subglobose, echinate, commonly separable into 2-5 carpels. Seeds 

 solitary or 2 in each cavity. Embryo with flat, entire cotyledons. 



1. Triumfetta semitriloba Jacq. Annual, stellate-tomentulose. Stems 1-1.5 m. 

 tall, branched : leaf-blades ovate, rhombic or suborbicular in outline, 3-6 cm. long, ser- 

 rate, angulate or often shallowly 3-lobed, rounded or truncate at the base ; petioles as long 

 as the leaves or shorter : panicles narrow, elongated : sepals lanceolate, 5-6 mm. long, ap- 

 pendaged below the apex : petals cuneate-spatulate, slightly pubescent at the base : stamens 

 often 15 : fruit 4-5 mm. in diameter, 2-celled, copiously prickle-armed, the prickles about 

 as long as the diameter of the body, hooked at the apex. 



In waste places, peninsular Florida and the Keys. Naturalized from the West Indies. 



3. TILIA L. 



Trees, possessing a mucilaginous sap and a tough inner bark. Leaves alternate : blades 

 oblique, crenate or serrate, petioled. Flowers fragrant, in axillary or terminal cymes whose 

 elongated peduncles are adnate to a conspicuous bract. Sepals 5, thickish. Petals 5, naked, 

 or with a petaloid scale at the base, imbricated. Stamens numerous, inserted in a short 

 receptacle : filaments filiform, forked, often collected in 5 groups, one at the base of each 

 scale : anthers extrorse. Ovary superior, 5-celled : stigma 5-toothed. Ovules 2 in each 

 cavity. Fruit a berry, but nut-like, with a hard coat. Seeds 1 or 2 in each fruit, with a 

 cartilaginous testa. Embryo with crumpled 5-lobed cotyledons. Linden. Basswood. 

 Linn. Lime-tree. Bee-tree. Wahoo. 



Leaf-blades glabrous or essentially so, sometimes glaucous beneath. 



Leaf-blades green beneath, the teeth slender-tipped. 1. T. Americana. 



Leaf-blades glaucous beneath, the teeth not slender-tipped. 



Cyme-branches glabrous : staminodia entire. 2. T. avstralis. 



Cyme-branches pubescent : staminodia erose. 3. T. Flondana. 



Leaf-blades copiously and closely pubescent beneath, not glaucous. 

 Leaf-blades white, gray or silvery beneath. 



Bracts mostly abrupUy narrowed to the base of the peduncle. 



Leaf-blades gray or silvery-gray beneath, the hairs very short and close-set. 4. T. heterophylla. 

 Leaf-blades white beneath, the hairs rather long and cottony. 5. T. eburnea. 



Bracts mostly gradually narrowed and terminating remote from the base of the 



peduncle. 6. T. Michauxii. 



Leaf-blades brown or somewhat rusty pubescent beneath. 



Leaf-blades thick and firm, coiuously pubescent beneath. 7. T. pnhescens. 



Leaf-blades very thin, thinly pubescent beneath. 8. r. Icptophylla. 



