2 Proceedings of the Royal Irish Academy. 



illustrations ot the species are highly desii-able, especially as in this genus the 

 species are often difficult of diagnosis, and dried material mostly poor. In 

 addition to tlie three new species, I have given therefore figures of S. Alfredi 

 and S. drymarioidis. Tlie well-known S. Aizoon has already been figured 

 several times ; figures of S. linearc and of S. riscosum (as well as of S. Aizoon) 

 will be given in an account of the Sedums known in cultivation, which I 

 have prepared for the Koyal Horticultural Society of London. 



Section AIZOON. 



Sedum Aizoon Linn. 



Hills, Koshan and vicinity, province of Honan. I.At. about 33°. June 23, 

 1917. (li. H. Bailey, Sedum no. 4.) 



var. scabnun Maximowicz. 



Chiktingshan, border of the provinces of Hupeh and Honan, on the divide 

 between the Yang-tse and Hwai-lio rivers. I^t.about32°. Alt.l500-2o00 feet. 

 June 13, 1917. (L H. Bailey, Senium no. 7.) 



S. Aizoon is widely distributed over north-central and nortli-eastern 

 Asia. The variety has also a wide range, and is stated by Ma.ximowicz 

 to be commoner about Pekin than the type. 



Section SEDA GENUIXA. 

 Sedum limnloides sp. nov. 

 Hfrba perennis (vel fortasse biennis '(}, den.se rosulata, glabra. Radices 

 angu.ste fusiforraes, radiculas multas fil>ratas emitt«ntes. (W Wf,*; brevissimus, 

 dense foliosus, ramuni tioriferum erectum terminalem et ramos floriferos 

 axillares extrarosulares a<lscendent€s eniiltens. Kami floriferi simplices, foliosi, 

 4-6 cm. longi. Fidin rosiilae exteriora atque media glabra, angiu'^te oblonga, 

 confcrtissima, viriilia, marcescentia, l-l.'i cin. longa, 3-5 mm. lata, integra 

 nisi ad apicem semiorbicularem spinoso-marginatum albescinti-corneuni (ut est 

 vagina); spinae 7-13, spina media recta 1-5-2 mm; longa, caeterae dimidio 

 minores falcatae deflexae. Folia rosulae interiora lineari-oblanceolata, integra 

 acuminata, 1-2 cm. longa, 2-^5 mm. lata, rubropunctata, spina unica subulata 

 albescente 2 mm. longa armata. Folia ramorum floriferomm altema, inter- 

 nodiis longiora, 4-7 mm. longa, inferiora apice 3-5-.spinosa, siiperiora 1-spinosa. 

 Infloreseentia racemosa, terminalis, 2-25 cm. longa, 6-12-flora. Flore-f 45 mm. 

 longi, albi ? vel rubescenles ?, pedicellis 5 mm. longis. Srpada ovato-deltoidea, 

 fere ad imum libera, acuta, 1 mm. longa. Petala lanceolata, acuminata, 

 4'0 mm. longa. Stamina 4 mm. longa, antheris ovate- conicis. Squamae 



