PISONIACEAE. 17 



of 4 nearly equal sepals. Corolla wanting 1 . Androecium of 48 stamens, 

 borne like the calyx on the long hypanthium. Gynoecium a single carpel 

 borne in the hypanthium. Fruit an achene with reflexed spines at the top. 



1. PETIVKRIA [Plum.] L. Shrubs with extensively creeping or hori- 

 zontal rootstocks. Leaves with narrow stipules. Achenes appressed to the 

 spike-rachis. 



1. P. alliacea L. Stems 3-10 dm. tall, often with virgate branches: leaf- 

 blades obovate, elliptic-obovate, or elliptic, 4-12 cm. long: spikes 1-3 dm. 

 long, interrupted: sepals linear to linear-lanceolate, 3-4 mm. long, about as 

 long as the hypanthium: achenes linear-cuneate, 6-10 mm. long, the spines 

 as long as the body or less. GUINEA-HEN WEED. 

 Hammocks, pen. Fla. and the F. Keys. (W. /.) 



FAMILY 3. BATIDACEAE. SALTWORT FAMILY. 



Maritime partially succulent shrubs. Leaves opposite, fleshy, half- 

 terete, linear or clavaite, entire. Flowers small, dioecious, in axillary 

 cones. Staminate cones with persistent imbricate scales each subtending a 

 flower : calyx cup-shaped, 2-lobed : stamens 4-5, inserted at the base of the 

 calyx: filaments thick, alternating with staminodia. Pistillate cones 

 peduncled, 4-12-flowered, the scales deciduous: the flowers each consisting 

 of merely a 4-celled ovary with a sessile stigma. Ovule 1 in each cavity. 

 Fruit a fleshy cone. 



1. BATIS P. Br. Plants with smooth and glabrous foliage. Leaves with- 

 out stipules. 



1. B. maritima L. A glabrous pale-green strong-scented shrub, with spread- 

 ing or prostrate stems 0.5-1.5 m. long: leaves curved, 1-2.5 cm. long: cones 

 5-10 mm. long, ovoid; pistillate on peduncles 2-5 mm. long: bracts reniform 

 or suborbicular, often apiculate: fruit oblong or obovoid, 1-2 cm. long, short- 

 stalked, drooping. SALTWORT. 



Salt or brackish shores, nearly throughout Fla. (Cont., W. I.) 



FAMILY 4. PISONIACEAE. PISONIA FAMILY. 



Shrubs, trees, or vines. Leaves opposite or alternate: blades simple. 

 Flowers perfect, dioecious or rarely monoecious, cymose. Calyx of 5 

 united sepals, campanulate, tubular, or funnelform. Corolla wanting. 

 Androecium of 5-30 stamens. Gynoecium 1-carpellary. Ovary 1-celled: 

 style terminal. Fruit an anthocarp. 



Fruits angular, with rows of glands : calyx broad. 1. PISONIA. 



Fruits terete, glandless : calyx narrow. 2. TORRDBIA. 



1. PISONIA [Plum.] L. Armed woody vines, or shrubs or trees. Leaves 

 opposite: blades entire. Flowers in compound cymes. Calyx broadly funnel- 

 form or rotate, with a thin undulate recurved edge. Fruits dry, with rows of 

 glands. 



Stems mostly climbing, armed: leaf -blades abruptly pointed or short-acuminate: 

 fruits glandular from the base to the apex. 1. P. aculeata. 



Stems erect, unarmed : leaf -blades blunt or retuse : fruits glandular 



above the middle. 2. P. rotundata. 



1. P. aculeata L. Stems with spreading thorn-armed branches: leaf -blades 

 elliptic, oval, or ovate, 2.5-7 cm. long: pedicels slender: calyx-lobes mostly 

 longer than wide: fruits slender, 3-3.5 mm. thick. COCK-SPUR. 



Hammocks, E. Keys and F. Keys. (W. I.) 



Shrubs of Florida 2. 



