32 2 CAIN, DE OLIVEIRA CASTRO, PIRES, AND DA SILVA 



Table 24. Composition and structure of the natural forest of the Horto Botanico 

 do Instittito Agronomico do Sul, Pelotas, Rio Grande do Sul. Species are arranged 

 by strata, life-form,^ and leaf-size classes,^' with a distinction between those more 

 and those less important. Basic data by Dr. Jose da Costa Sacco, with the assistance 



of the authors (Cont.) 



Life form Leaf size 

 More important species 



Panicum missionum Ekman Gramineae H Mi 



Panicum laxum Sw. Gramineae H Mi 



Canna indica L. Cannaceae G Ms 



Pharus glaber HBK. Gramineae G Ms 



Oxalis sellowiana Zucc. Oxalidaceae G Mi 



Solanum sisymbri folium Lam. Solanaceae ? Ms 



Less important species 



Begonia semper florens Link & Otto Begoniaceae N Ms 



Solanum ciliatum Lam. Solonaceae N Ms 



Heimia salicifolia (HBK.) Link & Otto Lythraceae N N 



Solanum capsicastrum Link Solanaceae N N 



Baccharis gaudichaudiana DC. Compositae N A 



Baccharis sagittalis (Less.) DC. Compositae N A 



Baccharisc trimera (Less.) DC. Compositae N A 



Baccharis usterii Heering Compositae Ch Mi 



Blechnum brasiliense Desv. Polypodiaceae Ch Mi 



Doryopteris pedata (L.) Fee Polypodiaceae H Ms 



Polygonum hydro piper oides Michx. Polygonaceae H Mi 



Blechnum auriculatum Cav. Polypodiaceae H N 



Plants normally dying back to the ground, or nearly so 

 More important species 



Stipa megapotamica Spreng. Gramineae H Ms 



Alternanthera pilosa Moq. Amaranthaceae H Mi 



Urtica urens L. Urticaceae H Mi 



Salpichroa origanifolia (Lam.) Thell. Solanaceae H N 



Piptochaetium montevidense (Spreng.) Parodi Gramineae H N 



Piptochaetium bicolor (Vahl.) E. Desv. Gramineae H N 



Hyptis mutabilis (Rich.) Briq. Labiatae G Mi 



Oenothera longiflora L. Onagraceae G Mi 



Bidens pilosa L. Compositae Th Mi 



Silene gallica L. Caryophyllaceae Th Mi 



Senecio brasiliensis (Spreng.) Less. Compositae Th N 



Sida rhombifolia L. Malvaceae Th N 



Less important species 



Aristida altissima Arech. Gramineae H Mi 



Conyza notobellidiastrum Griseb. Compositae H Mi 



