97 



Broiigniartia Palmed, n. sp. Shrub, 1 J to 2i feet higjh, glabrous ; brancbes villous- 

 piibescent: leaves 2 to 3 incbes long; stipules large, 6 to 8 Hues long, ovate; 

 leaflets G to 8 pairs, oblong, appendiculate, glabrous above, with villous hairs 

 along the niarginsaud midrib below : iiilloresceuce in a terminal raceme ; liowers 

 mostly :5 to 3 in the axils of stipular bracts: peduncles i) lines long, enlarged 

 below the calyx : calyx G lines long; its two upper lobes high connate: petals 

 pnrplish : pods 1| to 2i inches long, glabrous and glaucous, oblong, tapering at 

 base, 3 to (i-seeded : seeds 3 to 4 lines long. — Rare, only a few plants seen near 

 the base of the mountain. Alamos, March 2G to April 8. No. 300. In B.gahgoides 

 the upper bracts are small, leaflets larger, etc. 



Diphysa racemosa, n. sp. Five to ten feet high, the younger parts, foliage and in- 

 florescence, very v)«cid, granular : leaflets 9 to 17, oblong, small, 3 lines or more 

 long : racemes axillary 8 inches or more long : pedicels 4 lines long : 2 bractlets 

 at base of flowers, oval, 3 lines long: calyx about 6 lines long, the slender tube 

 below the disk 2 lines long : legume on a stipe 6 lines long, oblong, 1^ inches 

 long, f inch broad.— Ilill-slopes, in deep soil near Alamos. March 26 to April 8. 

 No. 295. The wood is very hard and yellowish, covered with a dark-brown bark 

 abundantly spotted with many Iiorizontal lenticles. This is both in flower and 

 fruit. It is almost gummy and emits a most disagreeable odor. 



Explanation of Plate III.— Shows raconiesand foliage; o, legume; h, section of stem with 

 lenticles. All natural size. 



Coursetia glandulosa Gray. A large scraggy bush with several stems. The stems 

 are often covered with a thick coating of gum. Dr. Palmer says it has great 

 medical value. The gum dissolved in water with sugar is used as a drink in 

 cases of colds and fevers, and as a remedy for consumption it is highly extolled. 

 It is sold in the drug stores at a dollar per pound, under the name of" Guma So- 

 nora."' The plant is known as "Samo prieto," It grows at the base of the 

 monntains in the gulleys. Alamos. March 2G to April 8. No. 3?3. 

 Willardia, n. gen. Calyx truncate with small eijual teeth. Petals equal; vexillum 

 orbicular spreading; wings falcate-oblong; keel slightly incurved. Vexillary 

 stamen connate into a tube with the others except at base; anthers uniform. 

 Ovary sub-sessile with several ovules ; style incurved, glabrous or with a few 

 hairs at base; stigma capitate, minute. Legume linear-obloug, strongly com- 

 pressed, continuous within : seeds reniform, strongly compressed. A small tree: 

 leaves imparipinnate; leaflets detinite, entire, exstipellate. Stipules obsolete. 

 Racemes axillary. Flowers "lilac," 



This plant was hrst named and described as a Coursetia by Dr. Watson, to 

 which genus it is closely related. The type specimens, however, were only in 

 fruit and it was doubtfully referred as above. The collection by Dr. Palmer of 

 an abundance of flowers shows a still greater divergence and demands the estab- 

 lishment of a new genus. 



It differs from Coursetia especially in its truncate calyx and glabrous style. 

 Its position, however (according to Dr, P. Taubort'), seems nearest Lennea, from 

 which it differs in its style and more membranaceous pod. 



It resembles Sahinea in its calyx bat differs in having racemes of flowers, and 

 also from this as well as all the other Robiniece except the above two, in its con- 

 nate stamens. 



At the request of Dr. Edward Palmer I have named this genus for his old 

 and valued friend, Hon. Alexander Willard, who for twenty-five years has rep- 

 resented our Government as consul at Guaymas, and has aided Dr. Palmer with 

 his various collections from this region. 



II am under many obligations to Dr. P. Taubert, of Berlin, who is preparing and 

 will soon issue the Leguminosa; in Die Natiirlichen Pflanzenfamilien, for confirming 

 my observations and adding new information. 



