MAGNOLIACEAE. — MAGNOLIA 397 



species they are more or less glaucescent below and the petioles are longer, and by 

 the seeds which have a deep broad groove on the ventral side and are concave at 

 the apex; in M. salicifolia and in all other allied species they are only slightlj' 

 grooved or convex on both sides and truncate at the apex. This new Magnolia 

 forms a shapely tree with many rather slender and spreading branches and a 

 wealth of leaves. It is quite rare and the flowers are unknown. No. 361^ is a 

 leafy shoot from the stump of a felled tree and the leaves are abnormally (20- 

 22 cm. long, 10-11 cm. wide) large. 



Magnolia Dawsoniana Rehder & Wilson, n. sp. 



Arbor 8-12-metralis, trunco ambitu 0.5-1.5 m., ramis patentibus; 

 ramuli crassiusculi, hornotini glabri, flavo-virides, annotini purpuras- 

 centes, laeves lenticellis sparsis exceptis; gemmae elongatae sparse 

 adpresse sericeo-pilosae. Folia coriacea, obovata v. elliptico-obovata, 

 obtusa V. brevissime acuminata, basi cmieata, rarius rotundata, 

 plerumque obliqua, 8-14 cm. longa et 4.5-7 cm. lata, utrinque glabra, 

 supra nitida, in sicco reticulata, subtus reticulata, pallide viridia v. 

 glaucescentia, maturitate interdum rufescentia, nervis utrinsecus 8- 

 12 supra ut costa leviter elevatis subtus manifeste elevatis; petioli 

 graciles, saepe purpurascentes, glabri, 1.5-3 cm. longi. Flores ignoti. 

 Fructus ramulum apice claviformi-incrassatum terminans, cylin- 

 dricus, circiter 10 cm. longus et 3-3.5 cm. diam., leviter curvatus, 

 breviter pedunculatus pedunculo crasso glabro; carpella matura 

 numerosa, modice congesta, fere omnia fertilia, lignea, compressa, 

 sparse lenticellata, valvis late ovalibus circiter 1 cm. latis et longis, 

 rotundata; semina plerumque 2 in quoque carpello, irregulariter 

 orbiculari-obovoidea, compressa, 10-12 mm. longa v. lata, aurantiaco- 

 scarlatina, testa interiore nigrescente basi rotundata apice truncata 

 V. rotundata ventre levissime sulcata v. plana dorso convexa. 



Western Szech'uan: near Tachien-lu to the south-east, alt. 

 2000-2300 m. October 1908 (No. 1241, type); same locality, October 

 1910 (No. 4116). 



The coriaceous shining green leaves and stout fruit readily distinguish this 

 species which is probably most closely allied to Magnolia denudata Desrousseaux. 

 It is possible that the leaves are persistent but our material is insufEcient to de- 

 termine this point. The tree is rare and only known from one rather remote 

 locality. It is in cultivation in the Arnold Arboretum. 



For geographical reasons it is possible that the plant referred to as Michelia by 

 Franchet in Nouv. Arch. Mus. Paris, ser. 2, VIII. 193 {PI. David. II. 11) (1886) 

 belongs here. 



Named for Jackson T. Dawson, the superintendent of the Arnold Arboretum, 

 in appreciation of his consummate skill in the propagation of the great mass of 

 material that has reached his hands during his forty-three years of service in this 

 establishment. 



