46 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



Ovary superior. 



Stipules sheathing the stem at the nodes POLYGONACEAE fp. 144). 



Stipules, if present, not sheathing the stem. 



Plants aquatic, submersed or growing on mud, low and delicate. 



Leaves whorled, dissected; style 1 CERATOPHYLLACEAE (p. 155). 



Leaves opposite, entire; styles 2 CALLITRICHACEAE (p. 197). 



Plants not aquatic. 



Styles 10. Berry 10-seeded; flowers in racemes. 



PHYTOLACCACEAE (p. 150). 

 Styles (if present) and stigmas 1-3. 



Leaves palmately lobed or divided Cannabis (p. 142). 



Leaves not palmately lobed. 



Ovary 3-celled ETJPHORBIACEAE (p. 194). 



Ovary 1-2-celled. 



Ovary 2-celled; flowers in racemes. Pod 2-seeded, circular, flat. 



Lepidium (p. 166). 

 Ovary 1-celled; flowers not in racemes. 



Leaves with branched hairs beneath Crotonopsis (p. 195). 



Leaves without branched hairs. 

 Stipules present. 

 Flowers unisexual; leaves toothed (except Parietaria). 



rETICACEAE (p. 142). 



Flowers perfect; leaves entire CORRIGIOLACEAE (p. 150). 



Stipules none. 



Perianth and bracts scarious AMARANTHACEAE (p. 148). 



Perianth and bracts (if present) herbaceous, not scarious. 



CHENOPODIACEAE ^p. 147). 

 AA. Petals present. 

 Pistils more than 1, distinct (inclosed in a fleshy receptacle in Rosa). 



Stamens inserted on the calyx (hypanthium) ROSACE AE (p. 173). 



Stamens inserted on the receptacle. 



Stamens united in a column by their filaments MALVACEAE (p. 202). 



Stamens distinct. 

 Plants succulent. Stamens twice as many as the petals; follicles many- 

 seeded CRASSULACEAE (p. 171). 



Plants not succulent. 

 Plants woody. 



Plants climbing; leaves peltate MENISPERMACEAE (p. 161). 



Plants not climbing; leaves not peltate. 

 Stipules encircling the stem, deciduous but leaving a ring on the 



twigs MAGNOLIACEAE (p. 161). 



Stipules none ANNONACEAE (p. 161). 



Plants herbaceous. 

 Sepals and petals 3. 



Plants aquatic CABOMBACEAE (p. 155). 



Plants terrestrial LIMNANTHACEAE (p. 198). 



Sepals and petals 4 or 5. 



Carpels distinct RANUNCULACEAE (p. 156). 



Carpels united at base. 



Pistil 5-lobed GERANIACEAE (p. 190). 



Pistil 2-lobed SAXIFRAGACEAE (p. 171). 



Pistil single. 



Leaves punctate with translucent dots. 

 Leaves simple; herbs or low shrubs; fruit a capsule. 



HYPERICACEAE (p. 204) . 



