SPACH. — REVISIO GENERIS IRIS. 99 



11/2-3 lineas lata. Flores verni, odorem Violœ odoratœ spirantes. Spa- 

 tha 1-11/2 pollicem longa, lutescens, v. viridi-lutescens, membranacea, 

 subscariosa, inflata, bivalvis; valvae subœquilongae, lanceolatse, acumi- 

 natae , nunc perianthii tubum superantes , nunc ovario v. imo pedunculo 

 superatae. Pedunculus gracilis, longitudine variabili. Perianthii tubus 

 5-6 lineas longus (ovario 2°-3° longior) ; limbus subcampanœformis, ses- 

 quipollicem longus. Sepala externa spathulato-oblonga, retusa, v. emar- 

 ginata, supra lutesceutia, subtus flavo, violaceo et albo variegata. Sepala 

 interna lineari-spathulata , emarginata , unicoloria (violacea v. caerules- 

 centia), exlernis paululo longiora , 3°-Zi° angustiora (vix lineam lata). 

 Stigraata limbo dimidio breviora, caeruleo-violacea, spathulato-oblonga, 

 — Rossia meridionalis. Sibiria. 



— (3 : uniglumis, Spach, ffist. Phan., 13, p. 36. — Caulis subnullus. 

 Spatha magna, univalvis, plerumque pedunculo longe superata. 



Iris humilis Bieberst. (Non Ker.), inprimis ab /, ruthenica diflert pe- 

 rianthii tubo longissimo; limbo dilute caeruleo. 



Subgenus X. — LIMNIRIS , ïausch. 



Rhizoma crassum , fibrillosum , annulatum , tortuosum. Caulis 

 teres v. subteres, simplicissimus, v. ramosus, 3-v. pluri-florus, 

 foliatus. Folia plana, ensata. Spathse2-v. 3-florae, terminales. 

 Flores inodori v. subodori, longius v. brevius pedunculati. 

 Perianthii tubus obconicus v. campanulatus , brevis , fauce cal- 

 losus, Sepala omnia imberbia , unguiculata , divergenlia : ex- 

 terna majora, arcuata, fere a basi deflexa : lamina ungue lato 

 liguliformi subconcavo juxta basin utrinque 1-dentato œqui- 

 longa ; interna recta , erecta : ungue complicato , lamina bre- 

 viori, utrinque juxta basin calloso. Stylus inadhœrens. Stigmata 

 lamillula-papillifera minuta, triangulari. Ovarium trigonum v. 

 triquetrum , prismatici^m , esulcum, ecostatum. Capsula obtusa 

 v. br éviter rostrata, subcoriacea, tenuis, trigona, 3-valvis, 6-ner- 

 via (nervis œqualibus v. subaequalibus , 3 valvarum margine, 

 3 alternis valvarum axi respondentibus) , reticulata; placenta 

 haud soluta. Semina lœvigata v. subrugosa, lucida, snbunise- 

 rialia. 



§ I. Folia angusta, sublincaria. Caulis flstulosiis. Spathœ membranaceœ, 

 scariosœ. Sepala externa ungue glaberrimo , ecarhwto. Sepala interna 



