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P. xalapense strictirameum 
ILLUSTRATIONS. 
Distribution of P. zalapense strictirameum........-.-.-2----+---++0+5- 
P. ciliatum......22-2.0 22 eee ee eee eee eee eee 
Distribution of P. ciliatum 
P. polycaulon 
P. fusiforme. ....2.22.020 00 eee eee eee eee ee 
Distribution of P. fusiforme..........-2-22.22.2 2022-02-02 eee eee eee 
P. arenicoloides..........-.-- dee eee ee ee eee eee eee eee ee eee eee eee 
Distribution of P. arenicoloides...............0-0 2c eee eee eee eee 
P. ovinum. ce eee ee eee eee Lee ee ee eee ee eee eee tees 
Distribution of P. ovinum.......--.-.---.-- 2. eee eee eee eee 
P, neuranthum.......2...---- wee eee cee eee cece ee cee eee eees 
Distribution of P. neuranthum.............2-.-- 2-020 2 ee eee ee eee 
P. bicknellii... 0.2.0.0... 002 eee 
Distribution of P. bicknellit 
P. calliphyllum 
Distribution of P. polycaulon 
P. strigosum..........02-2 2 eee 
Distribution of P. strigosum 
Distribution of P. calliphyllum.......-......2.2.2.-2-2-----002222+5- 
P. nudicaule.......2.-- 20 e ee ee eee ce eee teen eeee 
Distribution of P. nudicaule.............00 0002 ee eee eee 
P.. microcarpon 
Distribution of P. microcarpon................- 02.0200 
P. nitidum... 
Distribution of P. nitidum..........0000 0020020020222 eee eee eee 
P. multirameum.......-.-2- 0-0 eee ee eee eee eee eeee 
P, annulum.... cc cccccccc ccc cece cee ce eee eee eee cence eee eeees 
Distribution of P. annulum..........----20- 2 eee eee eee 
P. mattamuskeetense......-.-----000 eee eee eee eee ees ceeeeeeees 
Distribution of P. mattamuskeetense......2. 22.2.0 cece eee eee eee: 
P. clutei...... 
Distribution of P. clutei....... 2. ee ee ene .. 
P. boreale.... 
Distribution of P. boreale.............220 2 eee eee eee 
P., dichotomum.......---eeeecee cece cc ee ee ee ee eee ee eee eee eeee 
Distribution of P. dichotomum............-.--------22e eee eee eee 
P., barbulatum......cccccc ccc cece ee eee eee eee eee Lee 
Distribution of P. barbulatum..............----0-22--022220-5 waeeeee 
P. yadkinense 
Distribution of P. yadkinense.........--------- +--+ e eee 
P. roanokense 
ee en 
Distribution of P. roanokense........00. 020 e ee eee ee ee ee eee eee 
P., caerulescens.......0.- 200s Lecce eee eee eeeeee wee 
Distribution of P. caerulescens.......----- 0-2 eee eee eee eee eee ees 
P. aciculare..... 2.020.202 2-02 ee eee eee 
Distribution of P. aciculare 
P. chrysopsidvfolium 
Distribution of P. chrysopsidifolium 
P. consanguineum 
Distribution of P. consanguineum 
P. angustifolium 
Distribution of P. angustifolium 
Se ee ey 
