Diervilla. RUBIACE^E. 19 



yellow and villous on the face : capsule oblong, with a slender neck or beak, crowned with 



slender-subulate calyx-lobes. Meth. 492; Torr. & Gray, 1. c. excl. var. D. Acadiensis 



fruticosa, c., Tourn. Act. Acad. Par. 1706, t. 7, f. 1 ; L. Hort. Cliff. G3, t. 7 ; Duham. Arb. 



'ed. 1. D. Tournefortii, Michx. Fl. i. 107. D. Immilis, Pers. Syn. i. 214. D. Canadensis, 



Willd. Eimm. 222 ; DC. Prodr. iv. 330 ; Hook. Fl. i. 281. D. /tea,Pursh, Fl. i. 1C2. Lonicera 



J)i< rrilln, L. Mat. Mecl. 62, & Spec. i. 175. llocky and shady ground, Newfoundland and 



Hudson's Bay to Saskatchewan, south to Kentucky and Maryland, and in the mountains to 



N. Carolina. 



D. sessilifolia, BUCKLEY. Branchlets quadrangular : leaves ovate-lanceolate, gradually 

 acuminate, closely sessile, of firmer texture, more acutely serrulate : cymes several-flowered ; 

 corolla-lobes nearly equal, shorter than the tube, one of them obscurely pilose : capsule short- 

 oblong, short-necked, and crowned with short lanceolate-subulate calyx- Lilies. Am. Jour. 

 Sci. xlv. 174 ; Chapm. Fl. 170 ; Fl. Serrcs, viii. 292. Rocky woods and banks, mountains of 

 Carolina and Tennessee, first coll. by Curtis. 



ORDER LXX. RUBIACE^. 



Herbaceous or woody plants ; with opposite entire and stipulate leaves, vary- 

 ing to verticillate, or in the Stellatce the leaves in whorls without stipules (unless 

 accessory leaves be counted as such) ; mostly hermaphrodite regular flowers, 

 either o-nierous or 4-merous ; calyx-tube adnate to the ovary ; and stamens as 

 many as and alternate with the lobes of the corolla, inserted on its tube or 

 throat. Style single, sometimes with 2 or more lobes or stigmas. Fruit various : 

 seeds in our genera albuminous. 



Of this vast and largely tropical order 2G of the 140 recognized genera come 

 within our limits, but more than half of them only in subtropical Florida. They 

 rank under 14 of the 25 recognized tribes, too large a scaffolding for a frag- 

 mentary structure. So they are here disposed under three series ; of which the 

 third is only a special modification in foliage of the second. 



Series I. CINCHONACE^E. Ovules numerous in each cell. 

 * Fruit capsular : seeds numerous, flat, winged all round. 



1. EXOSTEMA. Calyx with clavate tube, 5-toothed. Corolla salverf orm, with long and 

 narrow tube and 5-parted limb ; lobes long-linear, imbricated in the bud. Stamens inserted 

 near the base of the corolla-tube : filaments and style filiform, exserted : anthers slender- 

 linear, fixed by the base. Capsule 2-cclled, septicidal. Seeds downwardly imbricated on the 

 placentae. 



2- PINCKNE YA. Calyx with clavate tube ; limb of 5 subulate-lanceolate lobes, or in the 

 outer flowers of the cyme one (or rarely two) of them an ample petaloid and petiolate leaf, 

 all deciduous. Corolla salverform with somewhat enlarging throat, and 5 oblong recurved- 

 spreading lobes, valvate or nearly so in the bud. Stamens inserted low down on the corolla : 

 filaments filiform : anthers oblong, fixed by the middle, slightly exserted. Style exserted : 

 stigma barely 2-lobed. Capsule didymous-glolmlar, 2-celled, loculicidal, and valves at length 

 2-parted. Seeds horizontal, with small nucleus, broad and thin lunate-orbicular wing, and 

 comparatively large embryo : cotyledons broad. 



3. BOUVARDIA. Flowers heterogone-dimorphous. Calyx with turbinate or campanulate 

 tube, and 4 subulate persistent lobes. Corolla tubular or salverform, the 4 short lobes 

 valvate in the bud. Stamens inserted on the throat or on the tube below it: anthers sub- 

 sessile, oblong or linear. Style filiform and more or less exserted in long-styled flowers, much 

 shorter in the other sort : stigmas 2, obtuse. Ovary 2-celled. Capsule didymous-globose, 

 coriaceous, loculicidal. Seeds peltate, somewhat meniscoidal, imbricated on the globular 

 placenta;. 



