1954] 



PLANTS COLLECTED IN NY AS ALAND 



467 



m., Aug. 18, 1946, 17320. New to Nyasaland, previously only known from Tan- 

 ganyika Territory. 



The specimen has rather longer leaves (ca. 1.1-1.5 cm.) than the Tanganyika 

 material of H. abietinum, but I see no other difference, and would regard it merely 

 as an habitat form. 



Helichrysum lastii Engl. Hochgebirgsfl. Trop. Afr. (Abh. Preuss. Akad. Wiss. 

 Berl. 1891:) 430. 1892; Moeser, Bot. Jahrb. 44: 279. 1910. 

 Zomba District: Zomba Plateau, occasional on an exposed rocky summit, per- 

 ennial herb 30-40 cm. high, plant grey-tomentose, flowers bright yellow, 1820 m., 

 May 31, 1946, 16127, Mlanje District: Mlanje Mountain; Luchenya Plateau, com- 

 mon and conspicuous in grasslands, often gregarious, perennial herb 30-50 cm. 

 high, leaves silvery-grey, flowers yellow, 1820 m., June -25, 1946, 16424. Nyasa- 

 land and Portuguese East Africa; a very similar plant collected at Nakuru in 

 Kenya (Scott Elliot 6843). 



Helichrysum (§ Leptolepidea) riparium Brenan, sp. nov. 



H. pachyrhizo Harv. tantum comparanda, capitulis haudquaquam rubellis, in- 

 volucri foliolis superne abrupte squarroso-reflexis parte reflexo undulato-crispato, 

 internodiis et foliis superne longioribus satis differt. 



Herba 30-40 cm. alta, erecta, basi et superne valde ramosa ramis erectc- 

 patentibus, praeter inflorescentias omnino dense sed breviuscule griseo-araneosa; 

 caules 1-3 mm. diametro; internodia superne circiter 1-2 cm. longa. Folia charta- 

 cea, laxa, recurva usque suberecta, lineari-oblanceolata, inferiora 3-3.8 cm. 

 longa et apicem versus 2.5-5 mm. lata, superne sensim decrescentia et plerumque 

 0.8-2 cm. longa et 1-2 mm. lata, omnia basi caulem arete et anguste amplectentia, 

 apice subacuta; costa et nervi vix cernendi. Inflprescentia valde laxa, e glomeru- 

 lis numerosis subsessilibus vel usque ad circiter 3 cm. longe pedunculatis sub- 

 globosis densissimis circiter 1-1.8 cm. diametro e capitulis compluribus effor- 

 matis basi foliis paucis amplexis composita. Capitula in glomerulis sessilia, ut 

 videtur homogama, circiter 24-25-flora; involucrum 5 mm. altum, apicem versus 

 6 mm. latum; foliola praeter extima glabra, scariosa, nitidula, albido-hyalina, 

 circiter 6-serialia, superne squarroso-recurva et margine undulata, apice acuta 

 vel apiculata, extima oblonga 2 mm. longa 0.5 mm. lata, interiora majora usque 

 ad 4*25 mm. longa 1 mm. lata parte inferiore viridulo-costata et hyalina superiore 

 albida. Flores <jf anguste tubulosi, 3.5^3.7 mm. longi, ad apicem minute 5-lobati, 

 tubo pallido apice purpurascenti, lobis luteis; antherae 1*4 mm. longae. Ovarium 

 dense p.ipilloso-glandulosum, pappi setis 3 mm. longis coronatum. Achaenia 

 obovoidea, 0.7 mm. longa, 0.3 mm. lata, purpureo-brunnea, glandulosa. 



NYASALAND: Chikwawa District: Lower Mwanza River, one specimen on a sandy 

 beach, herb, flowers yellow, bracts white, Oct. 3, 1946, 17938* ; ibid., occasional on 

 sandy beaches, herb 40 cm. high, greyish, bushy, flowers yellow, bracts white, 180 m., 

 Oct. 4, 1946, 17974 (TYPUS). 



ANGOLA: Mossamedes District: Between Umpupe and Palmfontein, 1000 m., Aug. 27, 

 1899, Baum 28 (Herb. Brit. Mus.). 



H, riparium has a distinct superficial similarity to H. pachyrhizum Harv., but 

 is distinguished by habit and capitula. In addition the longer internodes and up- 

 per leaves give H. riparium a laxer appearance than is normal in H. pachyrhizum. 

 In the latter the capitula are always, it seems, more or less tinted with rosy or 

 purple, a colour which is absent in the new species except for a slight tinge on 

 the corolla-tube. The phyllaries of H. riparium have a squarrose appearance even 

 when young, while in H. pachyrhizum they are at first erect (although becoming 

 reflexed later on), and always lack the pretty and characteristic crisping of the 



