

Si b-I i tss II HYPOGYNOUS EXOGENS. 



bypogynous insertion of the stamens hat jarded bj tlie French 



Botanists as one of verj fstematical importance; and it doi 



together a large mass of plants tin- genera of which ha-. 



other. If we assume that the entire separation of the calyx and corolla from th< 

 mens is an indication of those organs being in bypogynous plants ol 

 than usual, then the character acquires a physiological value not previously a- 

 lt And Buch appears to be the case; for it is only among bypogynous Ex 



we tin 1 a total absent f floral envelop* s, as in the Piperal and Ch nopodal Allia 



ii is among them that the pn I least moment, as th< 



racterofa Natural Order ; for in 12 Alliances out of 1 I, petals are eitht i tl> <>r 



freauentlv absent, and in one only are they often combined into a tube; in all other 

 such a circumstance i- exceptional. 



It is, however, found that in Borne cases plants with a perigynous insertion of the 

 stamens will nevertheless combine with hypogynous Alliances; as happens in th< 

 - myds among Violals, and here and there in the Erical, Silenal, and Chen 

 Alliances; but these again seem t" be mere exceptional instances not affectu . 

 general value of the hypogynous character, even where it i- certain that the I 

 which such exceptions occur are rightly placed. Experience Bhows too that all na 

 groups of plants come in contact here and there; and in such instai 

 habitual structure make their appearance. It will be found, mot tat the | 



nous Oi lers or gi at ra here and there introduced among the hypogj 

 to associate with any part of the perigynous Sub-class. Thus Samyds, a perigynous 

 Form of Violals, have no in any perigynous Alliance, while their affinity to 



the hypogynous Violals i~ of an obvious uatui 



The sequence observed in the arrangement of the Alliances is chi< flj ol ■■ on 



accounl of the pn - nee of Berberals in contact with.Ericals ; hut it we n gard Cyrillada 

 an 1 Pittosporade > Berberals, then the Erica! Humiriads join them j 



approximations have not yet received the Bancti f Botanists,and depend 



fication upon giving a higher value than customary to the pres 

 in copious albumen. 



There can be ii" doubt about the closeness of th<' relationship borne bj thi 

 Papayals to the hypogynous Violals, and therefore it is with the latter that 

 gynous series is made to begin. The transition from Violals 



Sapindals, and to Outtiferals is so much in conformitj I 

 entertained by Botanists, that m> objection to it is anticipati d. Hi 

 |ihal> i> more open t" criticism ; but it Tutsans are taki 

 farals, there i- no difficulty in admitting the justice of bringing Nympha 

 with them. The next relationship, that of Ranals, is obvious; their V 

 genus, Hypecoum, which stands on the limits of Fmrn 

 either CyriUads or Olacads will join the chain to Humirii 

 latt.r Alliance Heathworte themselves come distinct]) in o 

 mis Rueworte a-~ Correa. Geranials join Rutals b) mea 

 through Flaxworts ; and, finally, the ( hi nopodal and I 

 degraded forms >•!' die Silenal Alliance. Pipi rals ought, how< ver, t 

 later;, l off» i from ( benopodals rather than as an < >rd< r ii I 

 i" the perigj nous Sub-class. 



