ILLUSTRATIONS. IX 



Page. 



Fig. 105. Distribution of P. polycaulon 514 



106. Distribution of P. strigosum 514 



107. Distribution of P. aciculare 515 



108. Distribution of P. chrysopsidifoUum 515 



109. Distribution of P.fusiforme 515 



110. Distribution of P. arenicoloides . 516 



111. Distribution of P. ovinum 516 



112. Distribution of P. neuranthum 516 



113. Distribution of P. nitidum 517 



114. Distribution of P. multirameum 517 



115. Distribution of P. yadkinense 517 



116. Distribution of P. roanolense 518 



117. Distribution of P. caerulescens 518 



118. Distribution of P. leucothrix 518 



119. Distribution of P. wrightianum 519 



120. Distribution of P. tennessense 519 



121. Distribution of P. acuminatum 520 



122. Distribution of P. oKvaceum 520 



123. Distribution of P. villosissimum 521 



124. Distribution of P. pseudopubescens 521 



125. Distribution of P. sphaerocarpon 521 



126. Distribution of P. erectifolium 522 



127. Distribution of P. albomarginatum 522 



128. Distribution of P. poHoricense 523 



129. Distribution of P. lancearium 523 



130. Distribution of P. nodatum 523 



131. Distribution of P. scoparium 524 



132. Distribution of P. viscidellum 524 



133. Distribution of P. joorii 524 



134. Distribution of P. albomaculatum 525 



135. P. cordovense 526 



136. P. cordovense 526 



137. Distribution of P. cordovense 526 



138. P. chiriquiense 527 



139. Distribution of P. chiriquiense 527 



140. Distribution of P. obtusum. . 528 



141. P. stagnatile 528 



142. Distribution of P. stagnatile 529 



143. P. grande 529 



144. Distribution of P. grande 530 



145. P. tuerckheimii 530 



146. Distribution of P. tuerckheimii 530 



147. Distribution of P. zizanioides 531 



148. P. hirtum 532 



149. Distribution of P. hirtum 532 



