A PETALS. 11 



Leaves unequally pinnatifid: calyx-tube in fertile flowers 3-toothed Datisca, 64 



Leaves glaucous: white flowers in clustereil umbels Comandra. 



Leaves small, crenate: capsule axillary, obcordate Chrysosplenium, 56 



Leaves opposite. Calyx salveiform: capsule 1-seeded. (See Flora). .Nyctaginaceae. 



Calyx 4-lobed: stamens 4: flowers axillary Ludivigia, 60 



Calyx (corolla) tubular to rotate Caprifoliaceas, 66 



Leaves in whorls. Calyx 4-lobed or entire. Aquatic Halorageae, 59 



B. OVAKY SUPERIOR (free from the calyx). 



a. Herbs: leaves alternate, radical or in a whorl. 

 Sepals petaloid, persistent; akene 1, 3-sided or flat. (See Flora). . ..Polygonaceae. 



persistent: fleshy root-parasite, waxy-white bracts Allotropa, 74 



deciduous: carpels several or many Ranunculacea9, 14 



Sepals green: racemes close: capsules flat, 1-2 -celled Cruciferae, 1 9 



minute flowers opposite the leaves Alchemilla, 52 



Sepals none: dense oblong spike with petaloid involucre. (See Flora). . . .Anemopsis, 



spike naked: radical leaf 3-foliolate Achlya, 17 



6. Herbs: leaves opposite entire: capsule 1-celled except in the last. 



Stems square: calyx 4- toothed, with smaller teeth between, axillary Ammania, 59 



Involucre calyx-like or surrounding a head of flowers. (See Flora). . NyctaginaceaB. 



Flowers small, axillary, sessile white: stigma 1 Glaux, 76 



Flowurs green, terminal: stigmas 3 to 5 CaryophyllaceaB, 27 



Flowers axillary : capsule 3-5-celled Ficoideae, 65 



c. Shrubs or trees: leaves alternate, entire {except in the last): flowers perfect. 



Calyx tubular, bearing the stamens: akene plumose-tailed ..Cercocarpus, 50 



Calyx 6-parted, yellowish: leaves very aromatic. (See Flora) Lauraceae. 



Calyx 4-5-cieft, greenish: fruit berry-like, 2-4-seeded RhamnaceaB, 37 



Calyx 3-4-l()bed, yellow: stamens 6 to 12, exserted Dirca palustris. 



Calyx 5-cleft, large, yellow: stamens 5, united Sterculiaceas, 35 



d. Trees or woody climbers vnth opposite pinncUe leaves. 



Trees: flowers dioecious: winged fruit in drooping panicles Oleaceaa, 77 



flowers perfect : fruit 2-wiuged, 2-seeded Sapindaceae, 38 



Climbers: sepals 4: stamens and pistils many: akenes tailed Clematis, 14 



e. Dioecious shrubs with drooping silky gray aments Oarrya, 66 



