792 THEACEAE 
5. TRIADENUM Raf. 
Perennial glabrous, Hypericum-like marsh herbs, with horizontal rootstocks. Leaves 
opposite : blades elongated, thickish, punctate, with nerves conspicuously curving along the 
margins. Flowers rather few, usually in contracted cymes. Sepals 5, erect, equal. Petals 
5, pink to greenish purple, imbricated, not oblique, deciduous. Stamens mostly 9: fila- 
ments united in groups of 3’s, which alternate with scale-like, orange-colored glands. 
Ovary 3-celled, sessile. Styles 3, distinct. Ovules numerous. Capsule 3-celled, opening 
by 3 valves at the top, surpassing the sepals. Seeds numerous. [Elodea Pursh, not 
Michx.] Marsu Sr. JOHN’ S-WORT. 
Leaf-blades sessile, partly clasping or truncate. 
Leaf-blades broadest at the base or below the middle, partly clasping. 1. T. Virginicum. 
Leaf-blades mostly broadest above the middle, merely sessile. 2. T. longifolium. 
Leaf-blades petioled, narrowed at the base. 3. T. petiolatum. 
1. Triadenum Virgínicum (L.) Raf. Stems 2-6 dm. tall, often sparingly branched, 
rooting at the lower joints : leaf-blades oblong, elliptic or ovate. 2-10 cm. long, spreading, 
rounded or emarginate at the apex, glaucous and usually black-punctate beneath, sessile, 
the broad base clasping : cymes peduncled, few-flowered : bracts like the leaves but smaller: 
sepals lanceolate or oblong, 5-6 mm. long, acute, pale-margined: petals obovate to ob- 
lanceolate or nearly oblong, 8-10 mm. long, acute, delicately nerved : capsules oblong, 
8-10 mm. long, acute, fully as long as the sepals. 
In swamps, Nova Scotia and Labrador to Manitoba, Florida and Louisiana. Summer. 
2. Triadenum longifdlium Small. Stems 3-6 dm. tall, simple below the inflores- 
cence : leaf-blades oblanceolate, oblong or elliptic, thinnish, obtuse or notched at the apex, 
undulate, truncate or subcordate at the base, sessile : cymes terminal or axillary, few-flow- 
ered, sessile or short-peduncled : pedicels stout, 1-2 mm. long: sepals lanceolate or linear- 
lanceolate, 3-4 mm. long, acuminate : capsules oblong, about 1 em. long, acute, glabrous, 
striate. 
In swamps and low grounds, Alabama and Florida. Summer. 
3. Triadenum petiolàtum ( Walt.) Britton. Stems 3-10 dm. tall, usually branched, 
sometimes copiously leafy above: leaf-blades oblong, or elliptic-oblong, 2-15 em. long, 
obtuse or notched at the apex, glaucescent beneath, sparingly black-dotted, gradually or 
abruptly narrowed into short petioles: cymes few-flowered : bracts similar to the leaves: 
bractlets minute: pedicels 1-5 mm. long: sepals oblong or nearly so, 2-2.5 mm. long, 
obtuse, pale-margined : petals elliptic-obovate, 4-7.5 mm. long, obtuse: capsules oblong, 
prismatic, 8-10 mm. long, acute. 
In swamps, New Jersey to Missouri, Florida and Louisiana. Summer. 
FAMILY 7. THEACEAE DC. CAMELLIA FAMILY. 
Shrubs or trees, or rarely climbing vines. Leaves alternate: blades entire, 
toothed, or rarely digitately 3—5-foliolate: stipules wanting, or rarely minute 
and eaducous. Inflorescence commonly axillary, sometimes crowded into axil- 
lary or terminal racemes or panicles. Flowers mostly perfect, regular, showy. 
Calyx (usually subtended by several bractlets) of 5, or rarely 4-7, imbricated 
sepals. Corolla of 5, or rarely 4-7, distinct, or somewhat united, imbricated or 
contorted petals. Androecium of numerous stamens, or these rarely as many = 
the petals: anthers erect or versatile, opening lengthwise, or by terminal pores. 
Gynoecium of 3-5 united carpels. Ovary mostly 3-5-celled, sometimes partially 
immersed in the receptacle: styles as many as the cavities in the ovary, pomer 
times united. Ovules 2—many in each cavity, erect, horizontal or pendulous, 
anatropous, amphitropous or campylotropous. Fruit leathery or woody, dehis- 
cent or indehiscent. Seeds few or many. Endosperm wanting or fleshy. Em- 
bryo straight or nearly so, sometimes oblique, with flat or fluted cotyledons. 
Sepals slightly unequal : ovules 2, ascending: seeds lenticular, sometimes margined. 
Sepals ovate, united at the base: filaments united at the base: styles united : ^ 
Boxen chine MM MEME quUDM a lad dede 
PMiong-beaked: seeds apud du. : 2, MALACHODENDRON. 
Sepals very unequal: ovules 4-8, pendulous: seeds strongly angled or winged. 
Leaf-blades membranous, deciduous: flowers nearly sessile: filaments united 
into a thick tube: capsule globose: seeds angled. 3. FRANELINIA- 
Leaf-blades leathery, persistent : flowers long-pedicelled : filaments distinct : 
capsules ovoid : seeds winged. itm 4. GORDONIA. 
