TILIACEyE. (LINDEN FAMILY.) 59 



1. AYENIA, L. 



Involucel none. Calyx 5-partcd. Petals on long capillary claws, connivcnt 

 over the stigma. Fertile stamens 5, alternating with 1-2 sterile ones, their fila- 

 ments united into a pedicellate cup. Style single. Stigma 5-angled. Capsule 

 5-lobed, 5-cellcd, loculicidally 5-valved, the cells 1-seeded. Low shrubby plants, 

 with minute axillary flowers. Capsule rough. Albumen none. 



1. A. pusilla, L. Stems mostly simple, prostrate, downy; leaves (4"- 

 8" long) roundish or oblong, coarsely serrate; peduncles solitary, reflexed in 

 fruit; capsule depressed, muricate. South Florida. 1J. Stems 6' -12' long. 

 Flowers purple. 



2. WALTHERIA, L. 



Involucel 3-leaved, deciduous. Calyx 5-clcft. Petals 5, spatulate, convolute 

 in the bud. Stamens 5, united below. Ovary 1 -celled, 2-ovulcd. Style single. 

 Stigma penicillate or tuberculate. Capsule 2-valved, 1-seeded. Embryo in the 

 axis of fleshy albumen. Herbs or shrubs, with alternate leaves, and small flow- 

 ers in axillary clusters. 



1 . W. Americana, L. Stem erect, villous ; leaves ovate or oblong, acute 

 or obtuse, serrate, plicate, tomentose on both surfaces ; heads of flowers globose, 

 stalked, or subsessile and shorter than the petioles, the upper ones often spiked ; 

 calyx hirsute ; flowers yellow. South Florida. Stem 2 - 3 high, rigid. 

 Leaves l'-2' long. 



ORDER 24. TILTACE^E. (LINDEN FAMILY.) 



Trees, rarely herbs. Leaves alternate, with deciduous stipules. Flow- 

 ers axillary or extra-axillary, hypogynous, polyandrous. Sepals 4-5, 

 valvate in the bud, deciduous. Petals 4-5, convolute or imbricated in the 

 bud. Stamens distinct or united in clusters : anthers 2-celled, the pollen 

 grains smooth. Style single. Stigina 4-1 0-lobed. Capsule 2 - 5-celled, 

 1 -many-seeded. Seeds anatropous. Embryo in the axis of fleshy albu- 

 men. Cotyledons flat, leafy. 



1. TILIA, Tourn. LINDEN. BASSWOOD. 



Sepals 5. Petals 5, imbricated in the bud. Stamens numerous, united in 5 

 clusters, with a petal-like appendage (sterile stamen) opposite each petal. Ovary 

 5-celled, with 2 ovules in each cell. Stigma 5-lobed. Capsule 1 -celled, 1-2- 

 seeded. Trees, with cordate leaves, and several-flowered axillary peduncles, 

 which are connate below with a large ligulate veiny bract. Flowers cream-color. 



1. T. Americana, L. Leaves smooth and green on both surfaces, ob- 

 liquely cordate or truncate at the base, sharply serrate. Mountains of Georgia 

 and northward. June. A large tree. Leaves 4' - 5' wide. 



2. T. pubescens, Ait. Leaves hoary-tomentose on both surfaces, becom- 

 ing smoothish above, obliquely truncate at the base, mucronate-scrrate. Rich 

 soil, Florida to North Carolina, and westward. June. Leaves 4' -5' wide. 



