ANALYTICAL KEY TO FAMILIES OF ANGIOSPERMS. XXlll 



PAGB 



cc Stem not twining nor brier-like. 

 d Flowers in catkins. 



e Perianth 4-5 -parted Moraceae (in Urticaceae) 339 



ee Perianth none, or cup-like and not parted. 



/ Perianth cup-like Salicaceae 307 



ff Perianth none. 



g Bud-scales single Salicaceae 307 



gg Bud-scales several. 



h Leaves rugose-reticulated beneath, entire Leitneriaceae 322 



hh Leaves not as above Myricaceae 320 



dd Flowers not in catkins. 



e Leaves minute, 4-7 mm. long Empetraceae 598 



ee Leaves much larger. 



f Leaves pinnately compound Simarubaceae 582 



ff Leaves simple. 



g Leaves serrate-dentate Ulmaceae (in Urticaceae) 337 



gg Leaves entire or lobed. 

 h Flowers appearing before or with the leaves, or leaves evergreen. 



Lauraceae 435 

 hh Flowers appearing after the leaves. 



* Branches spiny Moraceae (in Urticaceae) 339 



it Branches not spiny. 



j Flowers racemose, umbellate, or clustered, small and numerous. 

 k Flowers densely spicate or capitate; hypogynous disk absent. 



Chenopodiaceae 368 

 kk Flowers racemose; disk present and lobed, or of separate scales. 



Santalaceae 345 

 jj Flowers solitary, or 1-3 together, larger Ebenaceae 721 



A A. Herbs. 



b FLOWERS IN INVOLUCRATE HEADS. 

 c Stamens distinct. 



d Plants scapose; leaves grass-like Eriocaulaceae 236 



dd Plant not scapose; leaves not grass-like; pistillate involucre woody. 



Ambrosiaceae (in Compositae) 908 

 cc Stamens syngenesious ; pistillate Involucre not woody. 



Compositae 913 

 bb FLOWERS NOT IN INVOLUCRATE HEADS. 

 c Leaves verticillate. 

 d Aquatic plants. 



e Leaves dissected, rigid Ceratophyllaceae 408 



ee Leaves simple, spiny-toothed, flaccid Naiad ace ae 40 



dd Terrestrial plants Araliaceae 677 



cc Leaves opposite or alternate. 



d Grass-like plants with linear parallel-veined leaves and greenish or 

 brownish flowers. 

 e Leaves usually in the \ phyllotaxy; mostly with open sheaths; and 



usually with hollow culms Gramineae 61 



ee Leaves usually in the \ phyllotaxy, with closed sheaths; culms solid. 



Cyperaceae 158 

 dd Not gTass-like. 



e Aquatic, not rising above the surface of the water Naiad aceae 40 



ee Not strictly aquatic. 

 / Flowers with both calyx and corolla. 

 g Petals 3; herbs Alismaceae 53 



/g Corolla deeply 5-parted or petals 5; vines Ctjcurbitaceae 881 

 Flowers apetalous, or perianth-parts all similar. 



