PiM — On the Hairs of the Andrcecium. 425 



I. coccinea. — Hairs very short, often mere protuberances ; termi- 

 nal cell scarcely exceeding the others (which are much larger than 

 in other species of Ipomsea), but is flattened and oblique, resem- 

 bling those of Calystegia. Diameter "006 ; terminal cell -0006 long 

 by -003 wide (pi. xx., fig. 7). 



Calystegia sepimn. — 'Hairs very short, composed as in the last 

 of a few large cells ; terminal cell but little differentiated. Dia- 

 meter "003 (pi. XX., fig. 8). 



C. sylvatica. — Similar to C. sepiuni ; more slender ; cells 

 longer ; terminal cell scarcely distinguishable from others. Dia- 

 meter '0025 in. 



LOBELIACE^. 



Lobelia cardinalis. — Hairs distributed on filament ; dense ; vari- 

 able, short and thick, or long, and somewhat slender ; unicellu- 

 lar ; very rugose, with minute warts. Diameter "0010 (pi. xix., 

 fig.^7). 



L. erimis. — Hairs very scanty on filament ; rather short ; wall 

 extremely delicate ; smooth, with a few comparatively long 

 granules. Diameter '0008 (pi. xix., fig. 8). Pollen slightly un- 

 even in outline. 



SCROPHULARIACE^. 



The hairs in this order are usually flattened, wider at the apex 

 than at the base, hence often more or less spathulate (except Brow- 

 allia). 



Browallia elata. — Distributed over filament ; somewhat dense ; 

 pluricellular ; often branching, chiefly unilaterally, like deer's 

 antlers ; somewhat thick ; wall delicate. Diameter ■0013-'0015 in. 

 (pi. XIX., fig. 11). Pollen polyhedral. 



Verbascum nigrutn. — Filament densely bearded with purplish 

 hairs, which are large ; spathulate ; rugose, with minute ovate 

 warts placed obliquely across the hair ; variable in size. Dia- 

 meter across top, -0050 ; of shaft, -0010 (pi. xix., fig. 13). 

 The other species of Yerbascum present similar hairs, varying 

 only in colour and size. 



Celsia arcturus. — Hairs very similar to Verbascum, scarcely 

 distinguishable (pi. xix., fig. 12, a, b). 



AntirrJiinum majus. — Hairs at extreme base of filament only, 

 resembling those of Yerbascum and Celsia, but much smaller, and 

 minutely rugose (pi. xix., fig. 21J. Diameter "0010. 



SCIEN. PKOC. R.D.S VOL. IV. PT. VII. 2 N 



