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Jan. 5th 1879 80 Abronia umbellata

The winged fruit is very tough & leathery & the radicle protrudes from one end through small hole closely surrounded by tough fruit.— The farinaceous matter is absorbed by the one cotyledon with wonderful quickness & then base of cot Hypocotyl or summit of radicle, swells & grows in 36 or 48h to a wonderful extent, externally to the seed-coats, but within the fruit; at this period the upper low upper part of hypocotyl (or lower part of Hypocotyl if heel the heel consists of modified upper part of radicle) is doubled back on the heel, (& the cotyledon within seed-coat are doubled up) so that the heel, & in secondary degree the hypocotyl & cotyledon together make a very thick mass & this by growing & swelling splits the tough upper end of thick leathery leathery winged fruit & allow allows the arched hypocotyl to grow up, lengthen itself greatly & straighten itself.—

Fig 60 of Abronia umbellata

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According to the Permanganate of Pot. test, the whole of the Heel & a little below is formed by the hypocotyl.

There is nothing odd in base of Hypocotyl, being protruded from seed-coats with upper part & Cotyledons still included in seed-coats.— The base summit of radi radicle is enclosed in sheath continuous with heel & lowest part of Hypocotyl.

The bursting place of the "fruit" of Abronia is some little way beneath the point whence the radicle emerges.—

It is fruit with Mirabilis.—