APETAL^E. 15 



Stamens 2 or 4: ovary 2-celled Scrophulariaceae, 60 



Stamens 2 or 3: scarious corolla, 4-lobed Plantaginaceae, 67 



2. Flowers irregular: style 1; stigma entire or 2-lobed. 



Leaves or scales not opposite. 



Corolla flattened, heart shaped: stamens 6, united in 3's Dicentra, 84 



Corolla curved; leafless root- parasites: stamens 4 Orobanchaceae. 65 



Corolla more or less 2-lipped: ovary 2-celled: stamens 2-5 . Scrophulariace, 60 



Ovary inferior, stemlike Lobeliaceae, 47 



Corolla 2-lipped, spurred: ovary 1-celled: stamens 2: aquatic. . Lentibulariaceae, 65 



Leaves opposite or whorled: stamens 2 or 4. 



Ovary 2-celled Scrophulariaceae, 60 



Ovary 4-parted, forming 4 seed-like nutlets Labiatae, 65 



Ovary 2-4 lobed: small flowers in spikes or heads Verbenacese, 67 



DIVISION a-APETAL^E. , , i< 



A. OVARY INFERIOR (calyx adherent) or apparently so. 



Leaves cordate: calyx 3-lobed: ovury 6-celled Aristolochiacese, 68 



Leaves palmately lobed: tendril-bearing vines Cucurbitaceae, 43 



Leaves pinnate: calyx- tube 3-4 angled, prickly Rosaceae, 35 



Leaves unequally pinnatifid: calyx-tube in fertile flowers 3-toothed Datisca, 43 



Leaves glaucous: white flowers in clustered umbels Comandra. 



Leaves small, crenate: capsule axillary, obcordate Chrysosplenium, 121 



Leaves opposite. Calyx salverform: capsule 1-seeded Nyctaginaceae, 68 



Calyx 4-lobed: stamens 4: flowers axillary Ludwigia, 125 



Calyx (corolla) tubular to rotate Caprifoliaceae, 45 



Leaves in whorls. Calyx 4-lobed or entire. Aquatic Halorageae, 38 



B. OVARY SUPERIOR (free from the calyx). 



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



Sepals petaloid, persistent; akene 1, 3-sided or flat , Polygonaceaa, 69 



persistent: fleshy root parasite, waxy- white bracts Allotropa, 139 



deciduous: carpels several or many Rammculaceae, 17 



Sepals green: racemes close: capsules flat: 1-2 celled Crucifereae, 21 



minute flowers opposite the leaves A Ichemilla, 117 



Sepals green, 3 larger, spine-tipped; short style, bifid Illecebraceae, 25 



Sepals none: dense oblong spike with petaloid involucre Anemopsis, 71 



spike naked: radical leaf, 3-foliate , Achlys, 82 



