ITEACEAE. 23 



FAMILY 1. HYDRANGEACEAE. HYDRANGEA FAMILY. 



Shrubs or trees, or vines. Leaves mostly opposite: blades often 

 toothed. Flowers borne in raceme-like, corymb-like, or panicled cymes. 

 Calyx of usually 4-10 sepals, surmounting the often ribbed hypanthium. 

 Corolla of mostly 4-10 petals. Androecium of 8-many stamens. Grynoe- 

 cium of 2-5, or rarely of 10, united carpels. Ovary wholly or partially 

 inferior. Fruit capsular. 



Sepals, and petals, 5 or fewer : styles and stigmas mostly distinct : stigmas when 

 united elongate. 



Stamens 8-10 : corolla relatively small ; petals valvate. 1. HYDRANGEA. 



Stamens 12-20, or more : corolla large ; petals convolute. 2. PHILADELPHIA. 



Sepals, and petals, 7 or more : styles united : stigma depressed. 3. DECUMAKIA. 



1. HYDRANGEA [Gronov.] L. Shrubs. Leaf-blades toothed or lobed. 

 Sepals 4 or 5, minute, or petal-like in the marginal flowers. Petals valvate, 

 small. Stamens 8-10. Styles wanting. Capsule opening between the stigmas. 

 Spr.-sum. HYDRANGEA. 



Leaf-blades merely toothed : inflorescence corymbose. 1. H. arborcscens. 



Leaf-blades deeply lobed : inflorescence thyrsoid. 2. H. quercifolia. 



1. H. arborescens L. Shrub with sparingly pubescent branches and twigs: 

 leaf -blades thin, ovate, oval or elliptic: petals 1-1.5 mm. long: capsule-body 

 2-2.5 mm. long, broader than high. 



Banks of streams, w. Fla. (Cont.) 



2. H. quercifolia Bartr. Shrub with densely reddish-tomentose twigs which 

 are usually also arachnoid: hypanthium 3-3.5 mm. wide at maturity: ray- 

 flowers numerous, becoming purple: petals 1.5-2 mm. long: capsule-body about 

 3 mm. high. GRAY-BEARD. OLD-MAN'S BEARD. 



Rocky or sandy woods, n. Fla. (Cont.) 



2. PHILADELPHUS L. Shrubs. Leaves deciduous: blades entire or 

 toothed. Sepals 4 or 5, prominent. Petals convolute, relatively large. Sta- 

 mens numerous, or very rarely 15. Styles present. Capsule loculicidal. 



1. P. grandiflorus Willd. Shrub 2-3 m. tall: leaf -blades ovate-lanceolate or 

 elliptic, acuminate, 4-12 cm. long, glabrate or with short appressed pubescence: 

 sepals acuminate: corolla 4-5 cm. wide: capsule attenuate to the pedicel. 

 MOCK-ORANGE. 



Banks of streams and rocky slopes, w. Fla. (Cont.) Spr. 



3. DECUMARIA L. Vines. Leaves persistent: blades entire or spar- 

 ingly toothed. Flowers numerous in corymbose panicles, small. Sepals 7-10, 

 minute. Petals narrow, valvate. Stamens 20-30. Styles united. Capsules 

 opening between the ribs. 



1. D. barbara L. Stems with aerial rootlets: leaf -blades leathery, ovate, oval 

 or suborbicular or rarely obovate, 5-10 cm. long, toothed: hypanthium with 

 a prominent border: petals oblong to linear-oblong, 3-4 mm. long: capsule- 

 body 4-5 mm. long, with a conic beak. 



River-banks and low woods, n. Fla. (Cont.) Spr. 



FAMILY 2. ITEACEAE. VIRGINIA-WILLOW FAMILY. 



Shrubs or trees. Leaves alternate: blades toothed. Flowers perfect, 

 borne in racemes or panicles. Calyx of 5 sepals. Corolla of 5 narrow 

 petals. Androecium of 5 stamens. Gynoecium of 2 united carpels. Cap- 

 sule elongate, 2-grooved, septicidal. Seeds flattened. 



