REST PERIOD STUDIES WITH SEEDS 



17 



Rutaceae 



Ptelea trifoliata, L. 

 Xantnoxylum americanum, Mill. 



Anacardaceae 

 Rhus canadensis, Marsh. 

 Rhus glabra, L. 

 Rhus Toxicodendron, L. 



Staphyleaceae 

 Staphylea trifolia, L. 



Sapindaceae 

 Koelreuteria paniculata, Laxm. 



Rhamnaceae 

 Rhamnus cathartica, L. 



Vitaceae 



Vitis labrusca, L. 

 Vitis riparia, Michx. 

 Ampelopsis quinquefolia, Michx. 



Tiliaceae 

 Tilia americana, L. 



Elaeagnaceae 



Elaeagnus argentia, Pursh. 

 Elaeagnus multiflora, Thunb. 



Umbelliferae 



Chaerophyllum procumbens, (L.) 



Crantz. 

 Osmorhiza longistylis, (Torr) DC. 



Cornaceae 



Cornus stolonifera, Michx. 

 Cornus Baileyii, Coult. & Evans. 



Ebenaceae 

 Diospyros virginiana, L. 



Oleaceae 



Chionanthus virginica, L. 

 Fraxinus americana, L. 



Asclepiadaceae 



Asclepias sp. 



Labiatae 

 Blephilia ciliata, (L.) Raf. 



Solanaceae 



Solanum carolinense, L. 

 Solanum Melongena, L. 



Scrophulariaceae 

 Verbascum Blattaria, L. 



Plantaginaceae 

 Plantago major, L. 

 Plantago aristata, Michx. 



Rubiaceae 



Galium Aparine, L. 



Caprifoliaceae 

 Sambucus canadensis, L. 



Compositae 



Cirsium pumilum, (Nutt) Spreng. 

 Coreopsis sp. 



Helianthus laevigatus, T. & G. 

 Bidens bipinnata, L. 



On October 15 the greenhouse bench was required for other pur- 

 poses so that observations on the plantings had to cease on this date. 

 At that time more than one-half of the species planted had made no 

 growth. Whether they would have grown later is a question that 

 cannot be answered. However, the seeds remained in the bed long 

 enough to answer the main questions at issue, namely, which species 

 were able to germinate within a reasonable time after being planted 

 immediately following maturity, and after being dried for a month. 

 The species included in the list which follows the table were the ones 

 that failed to germinate at all up to the time the seed bed was de- 

 stroyed. 



A study of Table 6 discloses some interesting facts. One fact 

 that is very prominent is that many species seem to possess the 

 capacity for prompt germination immediately after ripening, while 

 others apparently must pass through a period of dormancy before they 

 will grow. Less than 50 per cent of the species planted made any 

 growth at all. 



