LOBELIACE^E. 47 



but few exceptions, are too small to be examined without the aid of a microscope skill- 

 fully used. The order is, therefore, far too difficult for the beginner. 



LOBELIACEJE. 



Herbs, mostly with milky juice, alternate simple leaves, scattered or racemose 

 flowers: the calyx adherent to all or half of the ovary: the corolla more or less irregular: 

 the stamens united into a tube closely inclosing the style: stigma commonly SMobed. 

 Key to genera and species, p. 134. 



HOWELLIA, Gray. 



H. aquatilis, Gr. Aquatic: submersed leaves, slender, mostly alternate, entire; 

 those above water broader and shorter, sometimes 1-2 toothed: flowers short- peduncled, 

 axillary: corolla lobes nearly equal, not surpassing the calyx. Ponds on Sauvies Island, 

 Columbia River. 



H. limosa, Greene. Weak procumbent branches, 6-12 inches long, leafy and florif- 

 erous throughout: leaves lanceolate, entire, sessile, 6 lines long: corolla white, the 

 wedge-shaped divisions a line long, the two upper narrower. On the margins of pools 

 near Suisun. 



DOWNINGIA. 



In Bay-Reg. BoL, the following species are described under the generic name Bolelia: 

 D. insign^, Greene. Erect, mostly simple, stems, few flowered: lower lip of the 

 corolla 6 lines broad, obovate, 3-lobed, the lobes and sides sky blue, darker veined, the 

 main portion white, bearing in the middle two oblong green spots: upper lip merely 

 bifid, the lobes ascending and parallel: throat of corolla with a pair of yellow folds in 

 a field of dark violet. 



D. tricolor, Greene. Branches weak and reclining: lower lip of corolla parted into 



3 equal, broadly obovate, truncate, and slightly cuspidate lobes, these deep blue at tip, 

 white below, the undivided part with a transverse, somewhat quadrate spot of dark 

 maroon: upper lip of two small segments slightly recurved, parallel. 



D. concolor, Greene. Numerous branches, forming a dense tuft: corolla all violet, 

 but base of lower lip very dark, bordered by lighter blue, the lobes slightly unequal, 

 very obtuse and somewhat cuspidate, upper lip cleft to the middle only. 



D. ornatissima, Greene. Taller than the preceding, 6-10 inches high: corolla pale, 



4 fold-like protuberances partly filling the throat: segments of the upper lip coiled 

 backward into a ring, the corolla tube at base of these segments abruptly raised into 

 a sharp protuberance. 



D. humilis, Greene. Only an inch high: segments of the calyx unequal, exceeding 

 the minute white corolla. 



