12 



MORPHOLOGY. 



Yellow corollas frequently show streaks (P 



striata) 



or 



patch 



(p 



Oederi) 



red. 

 patch 



These 

 is are 



eaks are often confined to the lip or occur on lip and tube 

 lly restricted to the hood 



of 

 the 



are 



pecifically constant (P. Oederi), they may 



Even when in general terms these markings 

 be altogether absent (var. heteroglossa), or 



may involve the 

 appear as sports 

 Eastern Himalaya h 



whole corolla 



rubra) 



But similar markings not infrequentl 



on 



corollas that are normally concolorous. Thus P. longifi 



sometimes a 



dark red hood and beak, while both in Sikkim 



the 

 ind 



in 



North 



Tibet it may have a purple lunul 



on 



ch side of the central line of its 



lly concolorous lip 



O 



the 



ther hand, this species sometimes occurs with 



rollas 



uniformly white 



and in this case it might easily be mistaken for P 



iphonantha (which 



also at 



times has white corollas), if too great reliance were placed on characters of colour 



attention 

 The va 



not directed to the other diagnostic characters 



of colour in normally red corollas differs somewhat, and consists of th 



ppearance of a greater or less amount of white 



This white may app 



in 



blotch 



(P. farfuracea 

 be and the 



Iphonantha), but tl 



is somewhat rare; and if 



P 



Tl 



1 variation is that the tube, th 



b 



these are confined to the 

 se of the hood* and the 



centre of the lip become uniformly white, the lobes of the lip, the hood proper, and the 



beak remaining red (P. confer tiflor a, zeylanica). In some spe 



deed this disposition of 



colour is the normal one (P. carnosa, corymbosa, odontophora), while, generally speaking, th 

 tube in red corollas is paler in 



tint than are the lobes of the 



*P 



dth 



t 



are 



paler than the hood. Finally, species with normally red corollas may have put 

 flowers (P. siphomntha), while species whose affinities are cleaf 



whit 



with 



oups 



in which 



red corollas normally prevail (P. albiflora amongst the Rostratae) may have white flowers 



nly 





The staminal insertion has b 



already discussed 



Th 



filaments are narrow 



d 



lis-ulate with a mesial main nerve, and occasionally 



The filaments elongate considerably in 



(P. bicomuta, elephant oides) with wavy 



those species where the staminal 



Both pairs of filaments may 

 hirsute and equally so, or with the posterior pair less densely hairy than the 



margins. 



insertion is not carried upwards by the elongating tube 



be 



hirsute, the posterior pair being glabrous 



anterior ; or only the anterior pair may be 



the other hand, all may be glabrous, but in no instance do we find the posteri 



On 



pair 



hirsute while the anterior pair are glabrous 



The h 



may prevail through 



the filament ; more usually they are confined to the upper portion, and may or may not 

 involve the connective. Sometimes, besides being hairy above, they are villous at the 



point of 



(P. pectinata\ and, very 



ely 



are 



villous only at the point of 



but glabrous elsewhere (P. Collettii) 



The staminal hairs are very early formed, and 



present 



in 



th 



They n 

 downwards 



youngest buds, and this condition affords one of the most constant 



thers are free and parallel, 

 as a rule lie horizontally. 



and most useful diagnostic characters of the 



g 



The 



ally obtuse, but may be sharply tailed (P. King 



d 



ay, however, have the tails 



inclined slightly upwards 



d oftener still 



slightly 



very 



ly (P. Perrottetii) are the long axes of the anthers vertical. 



The ovary is ovate or lanceolate 



> 



lly slightly oblique 



d 



ways with two 



locules. The placentas are doubl 



d vertical, 



d 



are 



fined to the lower third or 



fourth of the transverse septum. The ovules are amphitrop 



w 



ith 



ually a short 



funicle, are normally some multiple of four, there being two rows on each placenta, and 



vary from 4 in each locule (P. gibbera) to 56 in each locule (P. corymbosa) 



T 



styl 



first erect, curves backwards to approach the tube at the level of the limbus of the 



