ARTIFICIAL KEY TO FAMILIES 69 
11. Plants with basal leaves, often wholly submersed. Flowers 
in dense round heads. (14) . . . CERBIOCAULACEAE.. Pg. 113 
22. 
12. Flowers white; petals 3; sepals 3; flowers usually in succes- 
sive whorls on the stem. (13) . . . ALISMACEAE. Pg. 103 
12. Flowers blue, in a thick spike which is subtended by a leaf- 
hike sheath; (23)2). 4 ..) % «' PonTEpEREAGEsn, Pes 1G 
12. Flowers yellow, in elongated heads. (26) . Xyripaceag. Pg. 112 
Terrestrial Plants 
13. Flowers without perianth, on an elongated fleshy receptacle 
subtended by a leaf-like sheath. (27) . . ARAcEAE. Pg. 109 
13. Flowers with perianth of dry scales; grass-like plants. 
(21) oh Pea en eae OrDER GLUMALES 
(The Glumales are not included in this work.) 
ioeberianthenoby om Seales: Ge . «© « ss «a sh i a Glee 
24. 
14. Flowers regular or irregular, blue, the flower or cluster sub- 
tended by a leaf-like sheath. (24, 25) ComMMeELINAcEAE. Pg. 114 
14. Flowers or clusters not subtended by a leaf-like sheath . . 15 
15. Stamens and pistils free from each other . . .. . . . 16 
15. Stamens and pistils united. (28, 29) . . Orcuipacear. Pg. 146 
eee ee ete eh elt wand cos mea yiceee gle 68S io alin 
aeewoody yines: (30) . ... . =). +. SMaAckAR, Ps, 146 
MSbeOne. GA ets Oy ty), sia que 3. = ee ee 
ER CTAG hire Pt ys ee ae op can on ae eel ony GF aon, 
28. 
18. Perianth of unequal parts. (31) . . . . Irmacear. Pg. 142 
18. Perianth of equal parts. (33) . . . Harmoporacear. Pg. 141 
