Naturalisation in Extra-Tropical Countries. 253 



into consideration in these calculations on value of nutriments. The 

 deleterious principle of H. esculenta needs to be removed by repeated 

 treatment with boiling water, or by keeping the dried fungus for 

 about a year before it is used for the kitchen. Dr. M. C. Cooke 

 mentions as fair English substitutes of Morels Helvella lacunosa 

 (Afzelius) and H. mitra (Linne). Bergner and Trog illustrate as- 

 edible among fungs of Switzerland H. crispa (Fries). 



Hemarthria compressa, R. Brown. 



Southern Asia, Southern Africa, extra-tropical Australia. This 

 perennial grass, though somewhat harsh, is recommendable for moist 

 pastures, and will retain a beautiful greenness throughout the year in 

 dry climes ; highly esteemed by graziers in Gippsland (Victoria) ; 

 it is not injured by moderate frost. H. uncinata is a mere variety, 

 which grows down to high-water mark on estuaries of rivers ; also 

 otherwise on somewhat saline ground. H. fasciculata (Knnth) occurs 

 around the Mediterranean Sea. The genus is also represented by 

 one species in the warmer littoral regions of America. Remarkably 

 resistant to drought. 



Heracleum giganteum, Hornemann. (H. villosum, Fischer.) 



Caucasus and Taurus. One of the best of herbaceous scenic 

 plants. Matures seeds freely. 



Heracleum Sibiricum, Linne". 



Colder regions of Europe and Asia. A very tall biennial herb 

 with leaves of enormous size. Recently recommended for sheep- 

 fodder in alpine regions. This plant could also be turned to account 

 for scenic effect in horticulture, as well as H. dulce (Fischer) of 

 Kamtschatka. 



Heterothalamus brunioides, Leasing. 



Southern Brazil and Argentina. A dwarf shrub, furnishing the 

 yellow Romerillo-dye from its flowers. 



Hevea Guianensis, Aublet.* (Siphonia elastica, Persoon.) 



Guiana and nearest countries. A tree, rising finally to about 60 

 feet. To what elevation it does advance into cooler mountain- 

 regions, and whether it will prosper in sub-tropic regions, seems as 

 yet not to have been ascertained. To draw attention to this subject, 

 the plant is admitted into this work. In the United States were 

 120 india-rubber factories in 1883, employing 15,000 people. The 

 total importation of raw material there during that year was 30,000 

 tons, worth about six million pounds [J. G-. Baker]. In East- 

 Australia the plant thrives fairly well at least as far south as the 

 tropic of Capricorn [J. S. Edgar], 



