192 



edge extends is at present unknown), 

 straight, with several longitudinal im- 

 pressed lines or furrows, besides the 

 channel down the face: — 

 Leaves very rough, almost like that of fine 



glass-paper, 2-3^ ft. long, ^-| in. 



thick near the base, dull dark bluish^ 



green 



•• ••• •»• 9 0m 



18. sordida 



Leaves nearly smooth or only slightly 



rough, I-IJ- in. thick near the base: — 



Stem erect, up to 9 in. high ; leaves 



spreading l-^ll ft. long; flower-stem 



•branching „ 8. rth^ida. 



Stem none: flower-stem not branched : — 



Central or all the leaves of adulfc 



plants gradually but not widely 



diverging from base to apex, with 



the tips of the inner pair 6-12 in. 



apart, 2^-3 ft. long, usually 



somewhat distinctly banded when 

 young 



•• "• "•- •*. ... 



Pearsonii 



Central or all the leaves of adult 

 plants more or less parallel and 

 scarcely or not at all wider apart 

 at the tips than at the base, not or 



very indistinctly banded when 

 young : — 



Leaves 2^-3^ ft. long; channel at 

 about I ft. above the base nearly 

 as broad as the leaf, but much 

 narrower than it above; flower 

 with a tube 3^^ lin. long, and' 

 lobes about 6 lin. long 13. desertl 



Leaves 3-5^ ft. long; channel at 

 about 1 ft. above the base very 

 much narrower than the breadth 

 of the leaf; flower with a tube 

 4-6 lin. long, and lobes 7A-Q 7''- 

 . long 



flattened 







hodesiana 



or thicker than they are broad; channel at 



about 



broad as the leaf itself (this character is use- 

 less for dried or withered specimens, as the 

 channel contracts in the process of drying and 



•^"^ ^P?Tf '^'^''^ narrower than the leaf), 

 with reddish-brown margins, usually edged with 

 a white membrane; apex tipped with a hard 

 sharp point: — ' 



^^^"^a^i l^""^* plants 1 ft. or more high; leaves 

 ty..i?.^.g^^^^>5 persistent part of the 



^v-vAxv^xo 2~4 -lin, long 



Stem of adult plants (K9 in, hi^h- 



11. robusta. 



1-1 A lin. ions: 



ves 5-9 

 pedicels 



B. 



o 



section 



12, Ehrenbergii. 

 from, fka hr^Hr^ W4 .Y""™"' ^- »"*'^«" miu^iii^ * tin. or more thich 



':rti,f; Iti'TJa Xntzi % % 't- ;r ?"'^ h % '"if 



cKauTifil r?^«« ^j. / K^ncerzain m 25, H. laniujtnosa), with the 



26 



/ the leaf. 



insufficient to place it properly.) 



