530 POL YGONA CEAE 



B. Acyclic (except a few Coccoloboideae). 



II. POLYGO/VOIDEAE (endosp. not ruminate). 



1. Atraphaxideae (shrubs): Calligonum. 



2. Polygoneae (herbs) : Polygonum, Fagopyrum. 

 III. COCCOLOBOIDEAE (ruminate). 



j. Coccolobeae (usu. ?): Muehlenbeckia, Coccoloba. 

 2. Triplarideae (usu. dioec.): Triplaris. 



Polygonales. The i6th order of Archichlamydeae. 



Polygonatum (Tourn.) Adans. Liliaceae (vn). 30 N. temp. ; 3 in 

 Brit. (Solomon's seal). There is a sympodial fleshy rhizome, upon 

 which the annual shoots leave curious seal-like marks when they die 

 away. Infl. unilat.; fl. homogamous, bee-pollinated. 



Polygonella Michx. Polygonaceae (n. 2). 6 N. Am. 



Polygoniflorae (Warming). The 5th order of Choripetalae. 



Polygonum (Tourn.) L. Polygonaceae (II. 2). 175 cosmop., but esp. 

 temp, (ir in Brit., knot-grass, bistort, &c.); herbaceous. Some 

 are xero., some water plants (e.g. P. aniphibiuin L., which may 

 however be found almost as often on land, where its I. have not 

 the stalks of the water form). The fls. are in spikes and panicles 

 (the partial infl. is cymose). Fls. 5 , acyclic, usu. with a coloured 

 5-leavecl P and about 8 sta. Honey is secreted at the base of the sta., 

 and the fls. are visited by insects, but in varying degree (see the 

 series of sp. described by Miiller in Pert, of Fls. p. 509). Cleistog. 

 fls. are found under the ochrea in P. aviculare L. , &c. In P. vivi- 

 parum L. (alpine Brit.) many of the fls. are replaced by bulbils in the 

 lower part of the infl. (cf. Lilium, Allium). [P. Fagopyrum L. = Fago- 

 pyrum.] 



Polygyne Phil. (Plagiocheilus p.p. BH.}. Compositae (7). i 

 Chili. 



Polylepis Ruiz et Pav. Rosaceae (in. 5). 12 trop. S. Am. 



Polylobium Eckl. et Zeyh. = Lotononis DC. p.p. (Legum.). 



Polylophlum Boiss. Umbelliferae (in. 7). 2 W.As. 



Polymeria R. Br. Convolvulaceae (i). 7 Austr. 



Polynmia L. Compositae (5). 15 Am. 



Polymniastrum Small (Polymnia p.p.). Compositae (5). i E. 

 U.S. 



Polyochnella Van Tiegh. (Ochna p.p.). Ochnaceae. 12 trop. Afr. 



Polyosma Blume. Saxifragaceae (v). 12 Khasias to trop. Austr. 



Polyouratea Van Tiegh. (Gomphia p.p.). Ochnaceae. 4 Brazil. 



Polyozus Lour. Rubiaceae (inc. sed.). 2 China, Cochinchina. 



Polypetalae (BH.}. A division of Dicotyledons. 



Polyphragmon Desf. =Timonius Rumph. (Rubi.). 



Polyplethia Van Tiegh. (Balanophora p.p. ). Balanoph. i Indomal. 



Polypodiaceae. Filicales Leptosporangiatae, q.v. for more detail. 130 

 gen. with 3000 sp., cosmop., rare in dry regions (see Nat. Pfl. for 

 details of geogr. distr. ). Mostly herbaceous perennials with a creep- 

 ing rhizome or erect root-stock ; many epiphytic. Leaves usu. large 

 and pinnate, with sori on the lower sides. Each sorus consists usu. 

 of a large number of stalked sporangia, each with a vertical incom- 

 plete annulus and dehiscing transversely. An indusium may or may 

 not be present. 



