ANALYTICAL KEY TO FAMILIES OF ANGIOSPERMS. XX111 



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 



ii 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 ACEAE 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 grass-like. 



e Aquatic, not rising above the surface of the water NAIADACEAE 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 CUCURBITACEAE 881 

 Flowers apetalous, or perianth-parts all similar. 



