028 LYTHRACEAE 
islands may be considered a part of the West Indies. In hammocks Tetrazygia 
is usually a small tree; in pinelands it is usually a, shrub. 
FAMILY 2. LYTHRACEAE — LOOSESTRIFE FAMILY 
erbs, shrubs, or trees. Leaves mostly opposite: blades usually en- 
tire. Flowers perfect. Ca of 4 or 5 sepals, commonly accompanied 
by accessory teet Corolla of 4 or 5 petals, or wanting. Androecium 
few or many stamens: anthers versatile. G cium of mostly 2-6 
B as Ovary 2-6-celled, or rarely l-eelled, free from the hy- 
panthi Fruit a capsule, included in the hypanthium.—Twenty-one 
| genera per about 400 species, widely distributed. 
Flowers regular or nearly so: hypanthium symmetrical. Tribe I. LYTHREAE. 
Flowers irregular: hypanthium oblique. Tribe II. PARSONSIEAE. 
. I. LYTHREAE 
Byeen campanulate or turbinate, becoming hemispheric 
obose. 
Herbs. 
Petals wanting: capsules indehiscent. 1. DIDIPLIS. 
Petals 4, except in Ammannia a capsules de- l 
iscent, sometimes irregula 
Capsules bursting irregularly. 2. AMMANNIA. 
Capsules septicidally dehiscent. 3. ROTALA. 
Shrubs or trees 
Flowers in "axillary cymes: aquatic shrubs. 4, DECODON. 
Hoe ers in terminal panicles: terrestrial shrubs or 
5. LAGERSTROEMIA. 
Hypanthium elongate, ee or tubular. 6. LYTHRUM. 
II. PARSONSIE 
Hypanthium enlarged or spurred on one side: Sce unequal. 7. PARSONSIA. 
1. DIDIPLIS Raf. Flaeeid herbs, resembing Callitriche. Leaf-blades 
arrow, entire, pellucid. Flowers solitary in the axils. Sepals 4, without ac- 
eessory teeth. Petals wanting. S 
. Style very short: stigma 2-lobed. 
Embryo with narrow -cotyledons. — One 
Species. | 
1. D. d (Nutt.) Wood. Stem 1-3 
dm. long: ersed leaves with linear to 
linear- Be alae p thieker than the sub- 
mersed ones, 1-2 em. long: eapsule urceolate, 
u mm 
je 
pos t Fla. "to fex., Minn., an 
x.)—Sum 
(M 
2. AMMANNIA L. Leathery-sueculent herbs. Leaf-blades, narrow, 
often auricled at the base. Flowers in axillary, sometimes 1-flowered, cymes, 
enish, or sometimes tinged with red. Sepals. 4, often accompanied with 
small teeth.  Petals P early deciduous, or wanting. Stamens 4-8. Style fili- 
form, sometimes short: stigma capitate. — with auricled cotyledons.— 
About 20 species, most abundant in warm regions 
oro present. 
Leaves broadest below the middle: capsule 3-4 mm. iH diameter. 1. coccinea. 
Leaves broadest above the middle: capsule 5-6 mm. in diameter. 2. T Koehnei. 
Corolla wanting. 3. A. latifolia. 
