916 PATAGONIAN EXPEDITIONS I BOTANY. 



i -celled with parietal placentae. Styles 3-5, clavate. Fruit a berry. 

 Leaves often lobed, with axillary tendrils. 



Family 72. Passifloracea, Passion-flower, p. 584. 



/3. Gynecium immersed in the axis, and united with it, I -celled. Flowers 



mostly yellow. Stamens many. Placentas parietal or superior. 



Leaves often compound. Family 73. Loasacece, p. 585. 



f6. (Opuntiales.) Flowers hemicyclic, sepalo-petalous, with spirally arranged 



sepals, petals, and stamens, on the tubular axis, and 4-00 carpels forming 



an inferior gynecium. Succulent plants, usually leafless and spiniferous. 



Family 74. Cactacea, Cactus, p. 591. 



ej. Flowers cyclic ; the gynecium commonly sunk in the hollow floral axis, and 

 often connate with the floral axis or the receptacle. Stipules usually none. 

 f. (Myrtales.') Flowers sepalo-petalous or apetalous, iso- or diplo-stemonous 

 (sometimes more by fission) ; rarely zygomorphic ; axis hollow, with 2- 

 oo carpels united in a free or adnate gynecium. 

 g. Seeds usually numerous, without endosperm. 



h. Flowers perigynous ; ovary more or less free, 2 6-celled. Stamens 

 13 times the petals. Bicollateral bundles. 



Family 76. Lythracea, Loosestrife, p. 599. 



h2. Epigynous. Stamens numerous. Style I. Shrubs or trees, with 

 opposite leaves, having oil-glands. 



Family 77. Myrtaccce, Myrtle, p. 60 1. 



7*3. Flowers epigynous, 4 5-merous. Stamens few, often 2-seriate. 



Herbs or shrubs with simple, non-glandular leaves, opposite or 



alternate. Family 78. Onagracea, Evening-primrose, p. 606. 



g2. Perigynous; tending to apetaly. Seed mostly i, pendulous, without 



endosperm, but with 2 integuments. Stamens about 8, in 2 series. 



Trees or shrubs, with rough, inner bark. 



Family 75. Thymeleacea, Mezereon, p. 597. 



g$. Seeds with endosperm, solitary in the carpel, and with only I integu- 

 ment. Flowers epigynous, sometimes diclinous. Stamens 48, or 

 12. Amphibious plants with alternate or whorled leaves, and small, 

 greenish flowers. Family 79. Haloragidacecz, Water-milfoil, p. 61 5. 

 /2. (Umbellales?) Flowers cyclic, sepalo-petalous, mostly isostemonous, epi- 

 gynous, 5-4-merous, mostly hermaphrodite, radiate. Flowers mostly 

 in umbels. Carpels i -seeded. Embryo small, in large endosperm. 

 Herbaceous or woody. 

 g. Flowers 5-merous. Styles as many as the carpels. 



h. Gynecium i- to several-celled. Stamens 5 or 10. Fruit a berry 

 or drupe. Woody, with palmately divided leaves, and umbels or 

 racemes. Family 80. Araliacea, Ivy, p. 619. 



Jt2. Gynecium 2-merous, the ripe mericarps coming away from the 

 axis. Sepals reduced to teeth or obsolete. Simple or com- 

 pound umbels. Leaves usually much divided, estipulate, but 

 with a sheathing base. Family 8 1 . Umbellifera, Carrot, p. 6 1 9. 

 g2. Flowers 5-merous. Gynecium 2-3 -celled; style I. Stamens mostly 



