9l6 PATAGONIAN EXPEDITIONS: 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. Placentae parietal or superior. 



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



e6. (Opnntiales.~) Flowers hemicyclic, sepalo-petalous, with spirally arranged 



sepals, petals, and stamens, on the tubular axis, and 400 carpels forming 



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



Family 74. Cactacecz, Cactus, p. 591. 



e"j. 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. Lythracece, 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. 



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



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



alternate. Family 78. Onagracece, 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 

 1-2. Amphibious plants with alternate or whorled leaves, and small, 

 greenish flowers. Family 79. Haloragidacece, Water-milfoil, p. 6 1 5. 

 f2. (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. Araliacecz, Ivy, p. 619. 



h2. 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 



