52 PLANTS WRIGHTIAN^. TI. 



cauline prickles are 4 or 5 lines long, and often 3 lines wide at their base. The 

 stems are apparently procumbent. 



M. Wrightii (sp. nov.) : suffrutescens, sericeo-puberula ; caulibus (decurabenti- 

 bus ?) aculeis sparsis brevibus rectis armatis ; stipulis subulatis ; petiolis parce 

 aculeolatis ; pinnis 7- 10-jugis ; foliolis 10 - 15-jugis dimidiato-oblongis fere aveniis 

 mucronulatis supra glabratis subtus sericeis ; spicis cylindricis ; floribus 4 - 5-meris 

 8 - 10-andris glabriusculis ; calyce corolla dimidio breviore ; ovario pubescente. — 

 Hill-sides on the Sonoita, Sonora ; Sept. (1041.) — "Many stems from the same 

 root, two or three feet long." Stems slender, striate-angled, in the specimens mostly 

 simple and herbaceous (the base not seen), copiously armed with straight and 

 conical, or slightly flattened, scattered prickles, which are from one to two lines in 

 length. Rhachis with the petiole 2 to 3^ inches long, armed with a few minute 

 prickles. Pinnae 7-9 lines long. Leaflets Ig to barely 2 lines long, half a line 

 wide. Spikes axillary, and somewhat panicled or racemose at the summit of the 

 stem, one to two inches long, densely flowered. Calyx and corolla minutely puber- 

 ulent, membranaceous ; the latter broadly funnel-form, a line and a half long. 

 Stamens three or four times the length of the corolla. Legume not seen ; the 

 specimen being in flower only. — This would appear to be related to M. puberula, 

 Benth. in Hook. Lond. Jour. Bot. 5. p. 88 ; but that is described as unarmed, and 

 with larger leaflets. 



M. Grahami (sp. nov. Ameria, Acanthocarpae) : frutescens, decumbens, glabra ; 

 caule aculeis infrastipularibus geminis rectis cum paucis sparsis subrecurvis armato ; 

 rhachi communi saepeque partialibus aculeolis recurvis raris obsitis ; stipulis seta- 

 ceis; pinnis 6-8-jugis; foliolis 10 -15-jugis oblongis venosis; pedunculis folio 

 brevioribus ; capitulis globosis ; floribus glabris 5-meris ; corolla calyce brevissime 

 dentato triple longiore ; legumine oblongo-lineari recto glabro margine rariter acu- 

 leolato vel inermi. — Mountain valleys of Sonora, between the San Pedro and the 

 Sonoita; Sept. (1042.) — " Stems many from the root, one or two feet high, pro- 

 cumbent," rather stout and rigid, lignescent ; the base probably truly woody. In- 

 frastipular prickles 2 or 3 lines long, straight : on some stems there are a number 

 of (similar, but more or less recurved) scattered prickles besides ; on others, scarce- 

 ly any. The small prickles on the leaves (on the main rhachis and often on its 

 branches also) are hooked. Rhachis with the petiole 3 or 4 inches long : pinnae 

 about an inch long. Leaflets 2-3 lines long, oblong or ovate-oblong, mucronulate, 

 oblique, coriaceous, 3 - 5-nerved at the base, and pinnately veined from the mid- 

 nerve (the veins conspicuous and somewhat reticulated underneath), glabrous, except 

 a few minute and scattered hairs along the margins, and on the rhachis. Peduncles 

 axillary, 7-18 lines long. Bracts minute. Corolla a line and a half long. Pod 

 an inch to an inch and a half long, three lines wide, straight, obtuse, glabrous ; 

 the margin beset with two or three minute prickles on each side, or else naked ; 

 the valves thick and coriaceous, separating entire from the margin at maturity. 

 Seeds 5 or 6. 



Calliandra Cham^drys, Engelm. in PI. Fendl. p. 39 ; var. pinnis nunc 4-jugis 

 (2-4-jugis); foliolis magis sericeo-pilosis (1-2^ lin. longis); pedunculis gracili- 



