ARAGOACE.E. I. ABAGOA. POLEMONIACEJE. 



237 



FIG. 25. 



This order is nearly related to the Pokmoniacece ; but differs 

 from it, in its undivided stigma, in the confluent cells of the 

 anthers and bilocular ovarium ; and from Scrophularineae, in its 

 regular flowers, foliaceous embryo, and convolute aestivation of 

 the corolla. 



I. ARAGO'A (named in honour of Francisco Arago, member 

 of Academy of Paris ; the celebrated astronomer.) H. B. et 

 Kunth, nov. gen. amer. 1. p. 154. t. 16-217. 



LIK. SYST. Tetrdndria, Monogynia. Character the same as 

 that of the order. 



1 A. CCFRE'SSINA (H. B. et 

 Kunth, nov. gen. amer. 3. p. 

 156. t. 216.) branches downy ; 

 leaves scale-formed, ovate-del- 

 toid, glabrous, closely adpressed, 

 with rather woolly edges : throat 

 of corolla villous. ^ . G. Native 

 of Santa Fe de Bogota. A. 

 juniperina, H. B. et Kunth, 1. c. 

 t. 216. 6. Segments of corolla 

 obovate, ciliated. Margins of 

 the segments of the calyx ci- 

 liated. Anthers cordate, reni- 

 form. Filaments villous at the 

 base. 



Cypress-like Aragoa. Shrub. 



2 A. ABIETIJJA (H. B. et 



Kunth, nov. gen. amer. 3. p. 156.) branches glabrous; leaves 

 linear, spreading, ciliated a little ; corolla glabrous. Tj . G. 

 Native along with the preceding. Branches 3-4 in a whorl. 



Fir-like Arogoa. Shrub. 



Cult. Aragoa is a genus of beautiful and singular shrubs. 

 Should either of them ever be introduced to our gardens, we 

 would recommend their being treated as greenhouse plants ; to 

 be planted in pots, well drained with sherds, in a mixture of 

 peat and sand. 



ORDER CLXII. POLEMONIA'CEJE (the plants contained 

 in this order agree in important characters with the genus Pole- 

 monntm.) Juss. gen. p. 136. ed. Usteri, p. 152. D. Don, in 

 edinb. phil. journ. H. B. et Kunth, nov. gen. amer. 3. p. 160. 



Calyx tubular (f. 26. a., f. 27. a.), 5-cleft (f. 27. a.), or 5- 

 toothed (f. 26. a.). Corolla rotate (f. 26. 6.), or salver-shaped 

 (f. 26. </.), or often funnel-shaped (f. 29. b.) ; limb 5-lobed (f. 

 !/., f. 29. b.), imbricate or twisted in aestivation. Stamens 

 26. c., f. 27. b., f. 29. c.), inserted sometimes beneath, and 

 sometimes above the middle of the tube ; anthers sagittate (f. 

 29. c.), incumbent, 2-celled. Ovarium simple, 3-celled (f. 28. 

 f.\ entire ; ovula numerous, rarely definite. Style very long 

 (f. 29. rf.) ; stigma 3-lobed (f. 27. c., f. 29. e.) : lobes linear, 

 obtuse. Capsule 3-celled (f. 28./.), 3-valved, oblong, trigonal, 

 rarely globose ; valves opposite to the margins, septiferous inside 

 in the middle, usually membranous, rarely thickish, and crusta- 

 ceous, as in the genus Cdntua ; placenta trigonal, central, applied 

 to the angles of the dissepiments. Seeds convex, angular, naked ; 

 or compressed and girded by a membrane ; testa simple, mem- 

 branous, the surface mucilaginous. Albumen fleshv, conform- 

 ing to the seed. Embryo straight, large ; with flat, orbicular or 

 oval, somewhat foliaceous cotyledons ; and a thickish, obtuse, 



straight, inferior radicle, which is generally shorter than the co- 

 tyledons. Beautiful herbs or shrubs, usually branched. Leaves 

 usually alternate, more rarely opposite, exstipulate, undivided, 

 pinnatifid, or pinnate. Flowers terminal, numerous ; or axil- 

 lary, and nearly solitary, in most of the species bracteate. Co- 

 rollas showy, blue, red, or white. 



This order is characterized by a regular, 5-lobed corolla ; 

 a triple stigma ; a 3-celled, 3-valved capsule, with septife- 

 rous valves ; seeds numerous, or definite, attached to a 3- 

 sided, central placenta, covered by a thin, mucilaginous inte- 

 gument, and furnished with a fleshy albumen ; and, lastly, 

 by a straight embryo, with somewhat foliaceous cotyledons. 

 The most nearly allied order to it is Concolculacece, which, 

 however, is readily distinguished from it, by having a simple 

 or double stigma ; by the septa instead of proceeding from 

 the centre of the valves, being directed to their margins ; 

 and the seeds having no central placenta, being attached to the 

 bottom of the cells. The seeds are very different, being covered 

 by a thin, very fragrant, mucilaginous albumen ; with a curved 

 embryo, having large, foliaceous, plaited, and wrinkled, emargi- 

 nate cotyledons. The Polemoniacece, through the genus Cdntua, 

 has some affinity likewise with Bignoniacece ; but that order has 

 an irregular corolla ; a bilamellate stigma ; a very different cap- 

 sule; transverse seeds, destitute of albumen; and lastly, a 

 foliaceous embryo, with a curved radicle. Externally the 

 Plumbagineee, have some resemblance to the Polemoniacea, 

 through Phlox and Plumbago; but the former order has 4 or 5 

 stigmas, and a simple ovarium attached to the bottom of the 

 calyx. 



Synopsis of the genera. 



1 POLEMOXIVM. Calyx campanulate, 5-cleft (f. 26. a.) Co- 

 rolla rotate (f. 26. b.) ; limb erect. Stamens inserted in the 

 throat (f. 26. c.), bearded at the base ; cells of capsule many- 

 seeded. 



2 DIAPE'NSIA. Calyx 5-parted, coriaceous, tri-bracteate at 

 the base. Corolla salver-shaped ; tube short. Stamens inserted 

 in the recesses of the corolla, nearly sessile. Stigma obsoletely 3- 

 lobed. Cells of capsule many-seeded. 



3 PHLOX. Calyx deeply 5-cleft (f. 27. a.), connivent. Co- 

 rolla salver-shaped (f. 27. d.) ; tube elongated ; limb twisted in 

 aestivation ; with cuneated segments. Stamens inserted above 

 the middle of the tube. Cells of capsule 1 -seeded. 



4 HUGE'LIA. Calyx tubularly campanulate ; segments some- 

 what spinose, linear. Corolla funnel-shaped ; tube short, ex- 

 serted ; segments of the limb oblong. Stamens inserted at the 

 throat. Cells of capsule many-seeded. 



5 LIN A'KTHUS. Calyx tubular ; with 5 strong green nerves, 

 which are drawn out into subulate, recurved teeth at the apex. 

 Corolla funnel-shaped ; tube short ; segments of limb obovate, 

 crenulated at apex. Stamens inclosed. Cells of capsule many- 

 seeded. 



6 LEPTOSIPHOK. Calyx tubularly-campanulate ; lobes linear, 

 subulate. Corolla funnel-shaped ; tube very long, slender ; 

 limb campanulate ; with oval, obtuse lobes. Stamens inserted 

 at the throat. Cells of capsule many-seeded. 



