This section is from the book "An Illustrated Flora Of The Northern United States, Canada And The British Possessions Vol2", by Nathaniel Lord Britton, Addison Brown. Also available from Amazon: An Illustrated Flora of the Northern United States, Canada and the British Possessions. 3 Volume Set..
[Schrankia Willd. Sp. Pl. 4: 1041. 1806. Not Medic. 1792.]
[Leptoglottis DC. Mem. Leg. 451. 1823?]
Perennial herbs, or shrubs, mainly prostrate or procumbent, armed with recurved prickles. Leaves bipinnate, usually sensitive; leaflets numerous, small; stipules setaceous. Flowers regular, small, 4-5-parted, pink or purple, perfect or polygamous, in axillary peduncled heads or spikes. Petals united to the middle. Stamens usually 8-12, distinct or united at the base; anthers all alike. Ovary nearly sessile; ovules ∞. Pod linear, acute or acuminate, spiny all over, at length 4-valved, several seeded. [Named in honor of the late Rev. Thos. Morong, a contributor to the first edition of this work.]
About 10 species, natives of temperate and tropical America, 1 in tropical Africa. Type species: Schrankia aculeata Willd.
Leaflets elliptic, strongly veined.
Leaflets linear-oblong, scarcely veined.
Herbaceous, perennial, branched, decumbent, 2°-4° long. Stem, branches, petioles and peduncles thickly armed with hooked prickles 1/2"-1" long; stem grooved and angled; leaves petioied; pinnae 4-8 pairs, distant; leaflets 8-15 pairs, obliquely elliptic, thick, obtusish and mucronate at the apex, inequillateral and rounded at the base, slightly ciliate on the margins, strongly marked with few elevated veins beneath, 2"-4" long; heads globose, very dense, 8"-12" m diameter; flowers pink; pods terete, very densely spiny, about 2' long.
Mimosa Intsia Walt. Fl. Car. 252. 1788. Not L. 1753.
Schrankia angustata T. & G. Fl. N. A. 1: 400. 1840.
Morongia angustata Britton, Mem. Torr. Club 5: 191. 1894.
Similar to the preceding species Pinnae 3-6 pairs; leaflets numerous, linear-oblong, thin, acutish or obtuse, not mucronate or but very slightly so, very obscurely veined, not at all reticulated, 1 1/2" - 3" long; peduncles shorter than the leaves; heads densely flowered, 5"-8" in diameter; flowers pink; pods linear, sparingly or densely spiny, 2-5' long.
In dry soil, Virginia to Florida, west to Tennessee and Texas. Sensitive plant. June-Aug.