CATALOGUE. 187 



Macrosiphonia* brachysiphon, Gray. {Echites brachysiphon, Torr. Bot. 

 Mex. Bound. 158, 43.) — Low, branching from a woody base; branches 

 puberulent ; leaves opposite, entire or wavy, lanceolate to oval, usually 

 acute; flowers yellowish-white, 1J-2' long; throat somewhat exceeding the 

 cylindrical tube, 1 £' across the expanded oval lobes ; follicles (mature) 

 3-6' long, 2-3" wide, puberulent ; coma rusty-brown, exceeding the seed. — 

 Limestone soils, Southern Arizona, at 5-6,000 feet altitude (646, 497). 



ASCLEPIADEiE. 

 By Dr. George Engelmann. 



PhilibertiaI cynanchoides, Gray, Proc. Amer Acad. 12, 95. Synops. 

 87. (Sarcostemma cynanchoides, Decaisne in DC. Prod. 8, 541. S. bilobum, 

 Torr. Bot. Mex. Bound. 160.) — Tall, climbing, glabrous or glabrate; leaves 

 from deeply cordate to sagittate or hastate, abruptly cuspidate or short- 

 acuminate, 1—2^' long ; peduncle 15-25-flowered ; slender pedicels much 

 longer than the flowers ; corolla whitish, nearly half an inch wide ; lobes 

 acutish, somewhat ciliate, crowns separated by a very short column. — 

 Cienega, near Tucson, Ariz. (566), Rothrock, 1874, and to Western Texas. 



Philibertia linearis, var. heterophylla, Gray, ib. (Sarcostemma hetero- 

 phyllum, Engelm Bot. Mex. Bound. 161.) — Glabrous or upward pubescent; 

 leaves 1-2' long, 1-2" wide, some tapering into a petiole, some with a 

 rounded, others with a dilated or auriculate-cordate base ; corolla 6" 

 wide, yellowish, purplish, or whitish, lobes ovate, crowns contiguous. — 



*MACso6iPnoNrA, Muell. (Arg.). — Calyx 5-cleft, with many small glands inside the base ; lobes 

 narrow. Tube of the corolla long, cylindrical ; throat short, campanulate or sometimes broader and longer 

 than the tube; no scales. Corolla-lobes 5, broad, often crisped. Stamens attached to the highest part 

 of the tnbe, anthers conniving aronnd the stigma and attached to it by a little below the middle ; anther- 

 cells produced into blunt appendages below. Scales of the disk 5, of which 3 are free and 2 united. 

 Ovary of two distinct carpels ; style filiform ; stigma thickened coriaceous, 5-ribbed, with the base pro- 

 duced into 5 reflexed lobes, acutely and somewhat 2-lobed apiculate ; ovules numerous in either carpel. 

 Follicles straight, terete, continuous or sub-torulose. Seeds oblong, crowned with a long (and at length 

 deciduous) coma. Albumen thickish ; cotyledons oblong ; radicle short. — TJndershrubs, erect, simple or 

 branched. Leaves opposite or whorled, with the margin often undulate-crisped. Flowers in a terminal 

 raceme or at length pseudo-axillary, few or solitary, on very short pedicels, white, yellow, or scarlet. — 

 Bentham & Hooker. 



tPHiLiBERTiA, H. B. K. — Corolla rotate, deeply 5-parted ; crown double, the exterior or membra- 

 naceous ring adnate to the base of the corolla, the interior of 5 (in ours tumid, hoodlike) scales adnate 

 to the base of the very short column ; pollinia suspended ; follicles smooth, acuminate. — Perennial, more 

 or less twining herbs. — (Sarcostemma, H. B. K. Bot. Mex. Bound, etc., not R. Br.) — Bknth. & Hook. 

 Gen. 2, 750. Gray, Proc. Amer. Acad. 12, 95. 



