PHYTOGEOGRAPHY OF MANOA VALLEY, HAWAIIAN ISLANDS 583 
Panicum pniriens Trin. HPC 
" torridum GsLud HC 
Phaseolus semierectus L HPC 
Plectranthus parviflorus Willd. . . . HC 
Plectronia odorata Benth & Hook. . SF 
Pilea peploides Hook. & Arn HF 
Sida cordifolia L HPC 
" rhombifoliah HPC 
" fallaxWalp HPC 
Solanum nodiflorum Jacq HR 
Stenotaphrum America?iuni 
Schrank HPF 
Waltheria Americana L HPC 
Wikstroemia uva-ursi Gray HPSR 
Group HI, Introduced Since the 
Advent of Europeans 
Acacia Farnensiana Willd SC 
Ageratum conyzoides L HC 
Argemone Mexicana L. . . . HC 
Asclepias Curassavica L HF 
Bidens pilosa L HC 
Bryophyllum calycinum L HPF 
Cardamine hirsuta L HF 
Cassia occidentalis L HPC 
Cenchrus calyculatus Cav HPR 
" echinatus L . . . HC 
Centaurea melitensis L HF 
Cestrum diurnum L AR 
Chenopodium album L HC 
Clerodendron fragrans Vent HPVR 
Crepis Japonica Benth HC 
Crotalaria fulva Roxb HPC 
" saltiana Andr HPC 
" spectahilis Roth HPC 
Cynodon Dactylon Pers HPF 
Cyperus rotundus L HPC 
Desmodium uncinatum DC HC 
Eleusine Indica Gaertn HC 
Erigeron albidus Gray HC 
" Canadensis h HC 
Eugenia Jambolana L AR 
Euxolus viridis Moq HF 
Indigofera AnilL, HPC 
Lantana Camara L SC 
Leucaena glauca Benth SF 
Mirabilis Jalapa L HPF 
Momordica charantia L HPVR 
Nicotiana glauca Grah AR 
Opuntia megacaniha Salm HPC 
Paspalum conjugatum Berg HPC 
Passiflora foetida L HPVF 
Paederia foetida L HPC 
Phyllanthus Niruri L HF 
Pithecolobium Saman Benth AF 
Plantago major L HR 
Psidium Guayava L SC 
Prosopis juliflora L AC 
Ricinus communis L SC 
Salvia occidentalis Swart z HR 
Sonchus oleraceus L HC 
Stachys arvensis L HF 
Stachytarpheta dichotoma Vahl.. . .HPC 
Solanum Sodomeum L SF 
Verbena Bonariensis L HPC 
II. THE TRANSITION REGION 
This term is used to designate the "knife-edged" portion of the 
lateral ridge, which lies between the foothill and the mountain ward 
termination of the ridge in the main range. The mountainward limit 
of the foothill area is clearly defined by an eminence or little peak; 
beyond this the ridge abruptly descends and narrows. The con- 
spicuous vertical erosion which has produced the "knife-edged" crest 
so characteristic of this portion of the ridge, indicates clearly the 
heavy rainfall to which it is subjected. The crest of the foothill is a 
broad, sloping, triangular plane; the crest of the transition or inter- 
