FLORA OF WASHINGTON AND VICINITY. 79 



Crataegus Oxyacantlia, L. Exglish Hawtiiorx. 



Near Alexandria. Last of April or first of May; fruit in October. 



t Crataegus coccinea, L. Scarlet- fruited Thorx. 

 End of May. 



Crataegus Crus-galli, L. Cockspur Thorn. 



Latter jiart of May. 



Crataegus parvifolia, Ait. Dwarf Thorn. 



High Island (a single bush), also Great Falls. Third week in May. 



tAmelanchier Canadensis, Torr. & Gray. .June-berry. Service-berry. Shad- 

 bush. 

 April ; fruit, middle of June. 



Amelanchier Canadensis, var. oblongifolia, Torr. & Gray. 



A greatly reduced form of tliis is common along ditches, flowering at the height 

 of ^ meter. Ajiril. 



SAXIPRAGACE.a5. 



Saxifrage Family. 



tSazifraga Virginiensis, Michx. Early White Saxifrage. 



The flowers oiien from among the rosettes of leaves before the stem is apparent 

 and continue centrifugally as the stem and branches emerge. Last half of March 

 or early in April. 



tMitella diphylla, L. Mitre-wort. Bishop's Cap. 

 Woodley ; rare. First half of May. 



t Heuchera Americana, L. Alum-Root. 

 End of May or beginning of June. 



Chrysosplenium Americanum, Schwein. Golden Saxifrage 

 Rare, in rocky cataracts. I'ebruary to April. 



tHydrangeaarborescens, L. Wild Hydrangea. 



Enlarged petals occasionally occur in the outer row of flowers. Late in June. 



tPhiladelphus inodorua, L. Mock Orange. Syringa. 

 Scarcely found in a wild state. June. 



titea Virginica, L. 



Rare. Eastern Branch ; Four Mile Run; Hunting Creek. Third week in May. 



Ribes rotundifolium, Michx. Gooseberry. 



Soldiers' Home, escaped; also at Mt. Vernon (Professor Chickering). Third week 

 in April; fruit ripe in July. 



Ribes ruhrum, L. Red Currant. 



Rare. Not yet collected in fruit. Last of April or first of May. 



CRASSULACBiE. 



Orpine Family. 



t Sedum ternatum, Michx. Stone-crop. Orpine. 

 Last half of May. 



