142 POLY G ONE ^. 



in. long, thick and almost woody ; outer lobes broadly subulate and 

 thorn-like, the inner broadly ovate, mucronate. — Native of South Africa 

 and Australia ; adventive on oiir sea-beaches ; collected in fruit by the 

 author, on a railway embankment at South Vallejo in 1874. 



4. HOLLISTERIA, S. Wa'son. Diffuse and frag-ile annual with 

 alternate cuspidate leaves and two small herbaceous free sti])ules at base 

 of each. Involucre solitary, sessile in the leaf-axil, comijosed of 3 slightly 

 united linear unequal obtuse bracts, 2-fiowered. Flowers unequally 

 pedicelled, with a minute scarious bract at base. Perianth turbinate, 

 membranous, 6-cleft to the middle. Stamens 9, on the throat, included. 

 Styles slender. Achene glabrous, ovate, triquetrous at tip. Embryo 

 curved ; the orbicular cotyledons accumbent. 



1. H. laiiata, Wats. Proc. Am. Acad. xiv. 296 (1879). Branches pros- 

 trate, 1 ft. long or more ; herbage loosely woolly : leaves elliptical or 

 oblanceolate, the lowest 1—3 in. long, the upper much smaller and more 

 ovate, aculeate-tipped ; stipules linear-subulate, 13 lines long : peri- 

 anth woolly, 1 line long, the linear-lanceolate lobes green, with a scarious 

 margin, the inner slightly shorter and broader. — An interesting plant, 

 perhaps somewhat local, near San Luis Obispo, Leinvwn. 



5. NEMACAULIS, Nuilall. Diffuse annuals with alternate (mostly 

 basal and rosulate) exstipulate leaves, and small flowers without 

 involucre clustered at the nodes of the slender branches. Flowers 

 perfect, each with a free herbaceous bractlet. Perianth 6-cleft, colored, 

 enclosing the achene. Stamens 3. Styles 3 ; stigmas capitate. Achene 

 short-ovoid, ol)scurely 3-angled. 



1. N. deiindata, Nutt. Journ. Philad. Acad. 2d ser. i. 168 (1847); 

 Greene, Bull. Torr. Club, xiv. 217 : N. NuUaUii, Benth. in DC. Prodr. 

 xiv. 23 (1856) ; Wats. Bot. Calif, ii. 16. Stems ascending, 1 ft. long, 

 terete, glabrate, purplish : leaves narrowly spatulate, 1—3 in. long 

 including the short petiole, densely tomentose-hairy on both sides : 

 bractlets of the flower-clusters obovate to spatulate, 1 line long, the 

 outer without flowers, the inner smaller, all very woolly within, glabrous 

 without : fl. yellowish, scarcely }-^ line long, slightly exceeding their 

 bracts, short-pedicellate, glabrous ; inner segments broadest : achene 

 I3 line long.— Along sandy beaches in the southern part of the State ; 

 perhaps not as far north as Santa Barbara. 



6. ERIOGIONUM, Michaux. Annual, perennial or suffrutescent 

 plants with radical or alternate or verticillate exstipulate leaves and a 

 greatly diversified inflorescence of involucrate, mostly small and dense 

 primary flower-clusters. Involucre campanulate, turbinate or oblong, 

 4— 8-toothed or -lobed without awns ; the pedicels few or many, more 

 or less exserted, subtended by scarious and narrow or quite setaceous 



