. Contributions from the Botanical Laboratory, vol. 12. Botany; Botany. IVtld Slower Preservation Society Goodyera pubcsccns although its soil must be maintained in a state of high acidity, and slugs be kept away if it is to remain in the garden long. Northern Rattlesnake-orchids, Goodyera mensiesii, repens ophioi- des, and tessclata. These three species apparently sur- vived the Glacial Epoch in high moun- tains south of the ice limit, and after deglaciation spread far north into Can- ada. They require soil of high acidity like the more widespread species first discussed, but unlike it demand
. Contributions from the Botanical Laboratory, vol. 12. Botany; Botany. IVtld Slower Preservation Society Goodyera pubcsccns although its soil must be maintained in a state of high acidity, and slugs be kept away if it is to remain in the garden long. Northern Rattlesnake-orchids, Goodyera mensiesii, repens ophioi- des, and tessclata. These three species apparently sur- vived the Glacial Epoch in high moun- tains south of the ice limit, and after deglaciation spread far north into Can- ada. They require soil of high acidity like the more widespread species first discussed, but unlike it demand in ad- dition that the soil be kept cool, and so are not to be successfully cultivated in lowland gardens. Southern Twayblade, Listera aus- tralis Lindley. This tiny orchid ranges from Flori- da to Louisiana and locally northward, having been able since the last ice sheet retreated to migrate as far north as central Ontario. So far as climatic con- ditions are concerned, then, it should be adaptable to cultivation almost any- where. It requires, however, a moist, intensely acid soil which is rarely avail- able in gardens, and moreover is highly susceptible to attack by parasitic fungi, and slugs. Allegheny Twayblade, Listera smallii Wiegand. The occurrence of this Twayblade both in the southern Alleghenies and in eastern Asia shows that before the Glacial Epoch it had an extensive range. Its more northern colonies were destroyed by the ice, and since the last sheet melted away it has not succeeded in migrating north of south-central Pennsylvania. Like preceding species it needs an intensely acid soil, and its most frequent habitat is in the litter of decomposing leaves under Rhododen- dron bushes. If a pest-free garden is available, its cultivation should be tried. Northern Tw^ayblades, Listera au- riculata, convallarioides, and cordata. While more adaptable to variable soil reactions than the species already dis- cussed, these three are apparently un- able to withstand much h
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