14 
2°. M. alba Lam. Leaflets truncate: corolla white, the standard longer than the 
other petals.—Commonly introduced in the Atlantic States in waste or cultivated 
grounds, and reported from Gillespie County; doubtless elsewhere in the State. 
7. TRIFOLIUM L. (CLOVER.) 
Tufted or diffuse herbs, with palmately (or sometimes pinnately) 3- 
foliolate leaves, toothed leaflets, stipules united with the petiole, flowers 
in heads or spikes, a persistent calyx with bristle-form teeth, and small 
membranous indehiscent pods often includedjin the calyx.—The common 
‘red clover” (7. pratense L.) of cultivation, and the “ white clover” (7. 
repens L.), which seems to be introduced almost everywhere, may both 
be found wild in Texas, and hardly need any description for recognition. 
* Perennial or biennial: heads not involucrate, terminal. 
1. T. reflexum L. (BUFFALO CLOVER.) Stems ascending, downy, not stolonifer- 
ous: leaflets obovate to cuneate-oblong, finely toothed: flowers large, on slender ped- 
icels, umbellate on the summit of the peduncle, reflexed when old: standard rose- 
red, wings and keel whitish: pod stipitate, 3 to 5-seeded.—The common ‘buffalo 
clover” of the Atlantic States and extending into Texas, where its western limit is 
unrecorded. 
** Low decumbent annuals: heads not involucrate, axillary and small: flowers at length 
reflexed: leaflets obcordate or obovate. 
2. T. Carolinianum Michx. More or less pubescent: corolla 4 mm. long, purplish, 
scarcely exceeding the green subulate calyx-teeth.—An eastern species extending into 
Texas. 
3. ‘T. amphianthum Torr. and Gray. Stoloniferous, very slender, nearly glabrous: 
flowers few, 8mm. long: calyx-teeth slender, much shorter, equaling the tube: small 
solitary fertile flowers often borne underground.—Extending from Louisiana into 
Texas, with an unrecorded western limit. Collected in Gonzales County (Chrisman). 
4. T. Bejariense Moric. Slightly hairy: calyx herbaceous, unequally lobed, nearly 
equaling the corolla; upper tooth nearly distinct, narrow; the rest broad, acute, retic- 
ulated: standard and wings broad, toothed, 6 mm. long.—The most common clover 
of southern and western Texas. 
*** Slender annuals: axillary heads subtended by a gamophyllous deeply lobed involucre: 
flowers not refleced. 
5. T. involucratum Willd. Glabrous: leaflets mostly oblanceolate and acute at 
each end: involucral lobes laciniately and sharply toothed: flowers 12 mm. long, in 
close heads: calyx-teeth thin, long and narrow, entire.—A common species from 
British America to Mexico and doubtless occurring in western Texas. 
8. HOSACKIA Dougl. 
Herbaceous or rarely somewhat woody plants, with pinnately 1 to 5- 
foliolate leaves, usually minute and gland-like stipules, yellow or reddish 
flowers solitary or few in pedunculate umbels, and a linear flat or some- 
what terete sessile several-seeded pod. 
1. H. rigida Benth. More or less appressed silky-pubescent: leaflets 3 to 5, from 
obovate or oblong to narrowly linear, 6 to 16 mm. long: peduncles short or long, 1 to 
5-flowered, with a sessile 1 to 3-foliolate bract or naked: flowers 12 mm. long, yellow 
turning to brown: calyx-teeth equaling the tube or shorter: pod 2.5 em, long, rather 
broad, pubescent. (Incl. H, puberula Benth, and H. Wrightii Gray.)—In the mountains 
west of the Pecos. 
