. Botany for high schools and colleges. Botany. BICOTTLEDONES. 473 â when dried and powdered constitute the ginger of commerce. That from the West Indies, called Jamaica Ginger, is considered the best. Sub-Order Cannce, with one polliniferous stamen, bearing a one-celled anther. Aside from Ganna, with its many ornamental spe- cies now common in gardens, one other plant deserves mention, viz. Maranta arundinacea, a native of tropical America, now grown ex- tensively for its fleshy rhizomes, from which a starch known as "Arrow- root " is obtained. 566. Cohort XV. Hydrales.âSmall aquati
. Botany for high schools and colleges. Botany. BICOTTLEDONES. 473 â when dried and powdered constitute the ginger of commerce. That from the West Indies, called Jamaica Ginger, is considered the best. Sub-Order Cannce, with one polliniferous stamen, bearing a one-celled anther. Aside from Ganna, with its many ornamental spe- cies now common in gardens, one other plant deserves mention, viz. Maranta arundinacea, a native of tropical America, now grown ex- tensively for its fleshy rhizomes, from which a starch known as "Arrow- root " is obtained. 566. Cohort XV. Hydrales.âSmall aquatic plants, with a hexamerous regular perianth, and stamens three, six, nine, or twelve. Order Hydrocharidese.âThis contains the Eel Grass, ValUsneria spiralis, and Water Weed, Anacharis Canadensis, common in our ponds ; the latter is naturalized in England, where it chokes up streams. Fossil Monocotyledons.âThe earliest Mono- cotyledon, so far as known at present, was a Tri- assic species of Tuceites, doubtfully referred to the Liliacese. In the Jurassic the Graminese, Cyper- acese, Liliaceae, Naiadacese, and Pandanaceae were yig age.âDiagram represented by a lew species. In the Cretaceous the of the flower of "Can- ^ ^ ,^. , â , J raa, showing thcoreti- Caunae, Dioscoreaceai, and Falmacea; appeared. cai structure. â After A species of the last-named order lias been discov- Sachs. â¬red in the Cretaceous of Western Kansus. In the Tertiary most of the modern orders of Monocotyledons were represented (however, no orders of Cohorts II., III., and XIII. have yet been found). Fifteen species of palms have been described from the Tertiary of the Great Plains and the Rocky Mountain region,* extending as far north as northern Dakota and Vancouver's Island. Their remains are also abundant in +,he Tertiary of Sub-Class II. Dicottledones. {ExogencB of De ) 567.âIn the plants of this sub-elass the first leaves of the embryo are two and opposite, hence
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectbotany, bookyear1888
